Incorrect billing

At the beginning on Feb I changed my payment date to the last day of the month instead of the 20th as before, so come March the 20th my service is disconnected I then pay my installment based on the information they gave me with a reconnection fee, now the 04/04/2026 my subscription is suspended again with an amount of R550.00 payable before I get reconnected, Ive been a customer of DSTV for years so why would they be so ***** i want my subscription reconnected ASAP and I want to know why must i basically two premiums for 1 month