Elderly being overcharged by DStv. Not rectified for over 2 months.

My dad who is a pensioner, has been a customer of Multichoice for well over 25 years, is now being overcharged for the second month in a row for almost 1 and half times what he usually pays. We have called the call centre a few times but we are not getting any return call, neither is the money being refunded. Dstv went about cancelling his contract that he had which expires in December 2023 and reconnected him at a higher premium. This absolutely absurd and is almost thievery. This needs to be rectified immediately! You are affecting an elderly's livelihood by taking money that is need for other purposes.