Disgruntled customer

Ive been having a subcription for the past +-10yrs with Multichoice and this past month August got a shockin and disatisfactory billing from them. My monthly subs was ridiculously billed by an extra R500 +. I called and queationed this on the Friday of 29 August and the consulatant I spoke to apologised and fixed the bill for me which I paid on the same Friday. The next thing that happened was I got an extra bill Tuesday where I was further demanded to pay R945 which I also questioned. Before I knew it my services were cut. Ive bever had a month which I missed except for the late payment on August 29 after realizing I hadnt been billed on the changed banking details which I supp**** and were never updated via the Whatsapp number they supply. Im so annoyed and have been unfairly treated by this service provider worse because Ive paid my monthly subcription.