DStv - Dstv billed me twice and disconnected my services

Dstv cancelled my connection without any valid reason telling me I owe them for last month. They are claiming that they can see the payment I made but it didn't come to them (dstv) it went to multi-choice as such I need to double pay now. Called them and they reconnected my services for 3 days and had to call them again. Bare in mind I have been charged for re-connection fee twice in month already. Spoke to Zimkitha who is a TL and she disconnected my call during our conversation!!!! I am old and a vulnerable customer. Dstv is putting me under a financial constraint