Bad customer service

On the 1 December I was called by a dstv agent regarding a price lock special where I would be paying 499 every month and to my surprise in December they billing me 699 and in month end Jan I paid 564 and they Dr 677 and I reversed the 677 and they closed my subscription. I queried this with their horrible call center consultants and they advised that the manager will call. Still waiting for their call its been 5 days now still nothing. I pray that we get another pay TV that will give this guys a huge competition or run them out of business