Dstv incorrect billing

Dstv has started with their incorrect billing and you spend lot of airtime trying to get hold of them to rectify their mistake. They do not even apologise to you. If you pay your normal monthly subscription, they will cut your viewing saying you have short paid. This not the first time this happens to me. Why must pay so much this month instead of R420 Your account balance:

R717.66 is due by 20 May 2021. Account Number: ***6 Customer Number: ***7