Leaving Avanti help

gayle.

Hi. I've been trying to leave avanti gas since the end of March. Its been a horrible year and my health has suffered so haven't been on the ball with doing this. I now need help please as I'm completely overwhelmed and don't know what to do.
My avanti contract ran out the end of March. I contacted flogas who won't take me as a customer as their rules around where the tank is situated have changed in the 5 or so years since I was last with them.
Calor accepted me and contacted avanti for the switch. Switch was denied as avanti cant/wont supply the manufacturers certificate and a refurbishment certificate. I got no paperwork on the tank when I moved here 10 years ago and it wasn't an issue when I went with flogas when I moved in.
Avanti now want 62ppl whereas calor want 48ppl so it's a no brainer to move suppliers.
I have been on the phone to avanti and also emailed several times. Phone people say they're chasing up the team that has the certificate, email people say they provided a 10 year test certificate dated 2015 but I've seen no evidence of this. Calor says they can't accept me without these certificates. 
Help! I don't know what to do now and I'm overwhelmed. I'm also disabled so panicking slightly as to what to do when my lpg runs out

Sorting_Hat

When tanks are bought/sold it is a process between the firms.
A tank with no paperwork is a cheap tank, so there are a couple of options for the LPG firms.
The new firm can buy the tank for the nominal amount then test the tank themselves, or they can decline to buy the tank and fit their own. The old firm would then collect their tank.