DSTV quick to bill inaccurately....

I am on a month to month contract. I signed up for the price lock as it was offered to my by the marketing team. The installer had just installed it today. I had to call dstv 3 times for them to cancel my month to month and only bill me on the price lock. My bill is now R1500 as they have not credited my account for my month to month which I paid for this entire month. What seemed like a seamless process is a nightmare. They good to sell their product but have no work ethic regarding their managing of accounts... You have to keep following up with them. No customer centricity at all!!!! My account has always been paid on time. This is how they treat loyal customers. No wonder Netflix is the way to go....They cannot adjust my account with the credit they referring me from pillar to post among various departments.....