Diabolical customer service deserves minus 6 stars

I have been trying for the last few months to change the bank account for contributions. I eventually receive a letter stating that this has been done but guess what no subscription has been deducted from my account. I rang and eventually got them to check the records and they say that it has come out of my particular Bank with account ending **** which is correct as my account ends in those numbers.

I double check again and guess what it has not come out of my account so just where are they getting the payments from. One of these days when he needs meds they are going to refuse stating it is not paid but when one rings up and gets put through to the extension a voice says to leave a message then says "sorry the mailbox is full" and down goes the call - it is ended. We phone again and explain then again the phone goes dead and suddenly it is leave a message. Still no resolution to this query since November 2020.