MTN IS *****ING MY MONEY

I've been a customer for 25+ years, they change my account number without notifying me. When I made a payment via EFT it does not reflect on my account, when I go in store and make a payment still it does not reflect on my account. I have send proof of payments numerous times to *** and 5 months later still waiting to get this problem resolved. All I get is a ticket number via email or an sms saying "you've failed to honour your payment arrangement" even after all my attempts by sending proof of payments. THEY ARE *****ING MY MONEY!!! I don't want to give them any star rating as they don't deserve any!!!!!!! How do I get my problem resolved??????