Bad service.

I called multichoice sometime last month, to find out why my subscription is low, they advised me to pay R423 as I was on the compku subscription, then when I checked my balance today 05/04/19 my balance shows R616 and I called why is it stating such an amount and they advised me that my account is on arrears with R87, then I asked how come as my account was paid in full and the gentleman blamed it on the system and I advised him to get me his supervisor and he said her supervisor is not on board and I asked her to get me any supervisor and he put me on hold for a long time and my airtime was exhausted..... I am very angry at how multichoice does things as I have been loyal to them for so long..... Now why is this happening??