I am enough with dstv

I reaaly don't know what to do now.....after the review I wrote last month am now getting overcharged for what i don't know. Last month I payed for my internet which was not loaded until the 12 when i escalated the matter. Now when i have to pay i see that i must pay 1347 from the 700 i payed monthly for my internet and dstv. I call them wasting my airtime and they all telling me different stories and they say they will escalate the matter. Now again i phone them today because the amount is not changing and no one is calling me i want to cancel my internet but I have been holding for 40 minutes for them to cancel i ended up hanging up. Please help me i reaaly need to cancel this internet and they must clear this amount beacause i know nothing about it. I am tired of leaving like this every month i will get another internet company