Disappointed and angry customer

I had a very bad experience with dstv, i signed up for price lock in march before increments kicked in, but to my surprise my premium stil increased in April, and in the month of August, they debited more than R1000, where as i'm on compact subscription, when i called in to query this, I was told my debit order bounced for the previous month and it didn't, i sent in my bank statement as proof, they said the'll investigate and refund my money, days passed and I called in again, now I was told that I "won" an upgrade on their wheel of happiness spins, hence i got debited for that, i told them i didn't do any upgrades, they still said they'll investigate and get back to me but weeks past i had to call in again en was told i won an upgrade twice hence the huge debit order and that they'll investigate and come back to me, to date i haven't received their call, and they couldn't even answer why my premium increased in April whereas I was on price lock!... Their service is pathetic and they have *********** agents working for them... And am very disappointed at Dstv