What does one do

I’ve been an old mutual client for more than 20 years to the latter part of last year I moved my RA to another investment house. I submitted my tax returns this year were rejected because the tax director from old mutual was incorrect. To add insult to injury they continued to debit my account to from January till now, even after the policy has been closed and moved from December last year. I’ve spent the last four weeks trying to resolve this absolute nightmare. I’ve had numerous calls and the minimum holding time before I could speak to anyone was 34 minutes. When eventually I escalated it after considerable fighting, I managed to get through to a team leader only to find that they will not give their direct telephone numbers and you have to go through the same tedious process if you want to talk to them. They claim that you must correspond through email, which one would expect a quicker response when dealing with a team leader but still the same shocking service. To add insult to injury, I was contacted by a old mutual telesales about car insurance Shame for that telesales, got the wrong person at the wrong time. But clearly, there is no communication in this organization. I still cannot submit my tax returns; I still don’t have a credit for the money they stole from me and I still don’t have an update as to when this will be resolved. Is there anybody out there that can point me in the right direction or assist in some shape or form?