The worst service ever!!!

MutliChoice call center agents and their system are clueless on what they're doing. 2018 I requested to be billed annually, an annual subscription was billed on my account. During the year DSTV debited my account twice. When I called and asked they said their system made an error. I've been calling and asking for refunds till today I'm still waiting. In Nov I called again requesting that since they over bill me yet I've made annual payments they must put my account back to monthly subscription. December an annual subscription amount was deducted, phoned to enquire they said on the system it says monthly they don't know what happened and a reversal was done 3 weeks later. On Monday the 14 of January 2019 I phoned to check up on my account, and it's still says monthly subscription but the amount to pay counts annually, I asked them to cancel and redo everything, she said she fixed it. This morning when I check balance to pay it still gives me an annual subscription. Like I don't understand do I have to drive to Randburg offices for DSTV to sort my account out?