Flight delay and cancellation compensation, Tui/Thomson ONLY

We had said we didnt want to go to any form of sales meeting etc but were told it was an intro to the hotel. We managed to get a 90% refund from the Money taken out from the sales meeting now but included in the post and was not expected from this level of holiday.

I would assume the rest of the complaints would be valid?

Earlier this year, my Family and I went on a once in a lifetime trip to the Dominican Republic, we went through TUI as they are a trusted brand and also went to a 5* Iberostar resort which had amazing reviews. We travelled with my then 3 year old and 9 month old daughters and were very excited.
This is the step by step experience that we had:

Our flight was diverted due to flooding of Puerto Plata airport, it was since found that Puerto Plata airport had been flooded for more than 24 hours prior to our take off and that our flight shouldn't have gone ahead in the 1st place.

When we arrived at the diverted airport (La Romana) we were left for over 45 minutes un shaded on the tarmac with an infant of 9 months old and a 3 year old with extremely fair skin as they had no plan for what to do with the 4 plane loads of travellers that were diverted there.
Because of this, our eldest daughter got sunburn on her face.

There were No reps to explain what was going on, No information as to how we were getting to our hotel, No access to our luggage, No refreshments for our family or buggy or comfort for infant.

There was nowhere to buy baby milk, nappies or wet wipes for our baby or any access to Wi-Fi to contact relatives.

Nothing for children for entertainment and when we eventually got offered a food Voucher at 18:30 we were unable to use it in half of the outlets meaning there were 90 minute queues for food and drinks.

We were eventually packed on to a coach which had no facilities for infants, no baby seats, no changing facilities and still no sign of a Tui Rep.

We were on this journey for over 5 hours throughout the Night (The journey started at 23:30), meaning we had to sit upright and were unable to sleep due to holding a very distressed, hungry 9 month old baby with absolutely no comfort for any of my family, not to mention the dangers of travelling in such a way.

This resulted in us missing out on 2 days of our holiday and only getting back to routine after 3 days.

While jet lagged, tired and lethargic we were thrown into a sales room where we were put in to a high pressure sales environment with the Iberostar holiday club reps. They had very broken English and confused us with discounted holidays all in dollars which we assumed was in local currency as nothing was said to the contrary (both countries use the $ sign and USD was not on the paper work).

The sales team also advised that we had 5 day cooling off period before any funds would be processed after signing up (which held the deal) yet they took Just shy of $5000 out of our account there and then!
We only received a 90% refund due to “processing fees” and us apparently using upper tier services, which we didn’t and they also had no record of this When asked.

To top it all off on day 8 all 4 of my family (as well as at least 50 others in the resort) got food poisoning from the Buffet! My wife, 9 month old, 3 year old myself had been vomiting with diarrhoea for 3 days meaning all 4 of us were once again confined to our room.
We later found out that a Canadian family were hospitalised at the same time as us and over 50 cases were reported.

After sending several emails of complaint, we are now being ignored.

What do we need to do? we have evidence of reporting to TUI while out there and pictures of my daughters sunburn?