Disgruntled loyal customer

Absolutely shocking service! I cancelled my contracts in February, was given a reference number and told where to pay it in writing. The next two months they still debited my account. I reversed the debit orders and contacted to find out why they still debited my account when the accounts were closed. I was informed that the consultant gave me the incorrect reference number and that it's not on the system. I them to rather refund me the money and allocate the money I now owe due to the debit order disputes. I forwarded the POP's to the next consultant who said she will open a case for payment allocation and After two weeks of phone calls, it was still not done. Last week Thursday I was informed that I have a case number and it would take them 72 hours to resolve. The next day they block my account as I'm in arrears (Yes while they owe me money)I am now sitting past 72 hours and its still "new". Payment allocation has not been done, refund not done and account still block. Nice way to treat a loyal customer.