Solar system installation - absolute nightmare!

Sansa

So we had a system installed in November from an MCS certificated company. Everything that could go wrong, went wrong - damaged, leaking roof (was just renovated because of the panels), dangerous electric system because of one of their unprofessional electricians, extra charges for electricity due to mistake made by them, missing fixings on the panels. Rude employees, angry and shouting + gas lighting. They reversed the polarity of my house and left it like this for weeks, putting my 6 years old daughter in danger as any appliance in the house could of gone live and kill her. All this unprofessional people are gone now, not working for the company anymore. Since then, some new employees  fixed some of the  issues and the company offered to fix the roof as well. I am really scared to let them do that. Is a huge job because they have to remove all the panels, take all the roof tiles off and fix the membrane, then put everything back on. Is a massive roof so will be about a week and I can't let them do that after all the damages they did. They offered to pay me just £600 as a compensation and I am sitting here scratching my head what to write in my 100th letter to them. I don't want them to fix the roof as I really don't trust the quality of their work, but £600 after all that is an absolute joke. I lost quite a lot of money because of them too - £120 extra for electricity because they reversed clamps, late paperwork for the solar system so I am still not registered to export the energy and loosing money in any sunny day like today, got numerous days off because of them as they had around 15 visits. Now I have to pay for the roof as well as they say that the £600 is their final offer.  Can anyone give advice please?

eskbanker

https://mcscertified.com/complaints-compliance/ suggests that they'll get involved if that would help?