Telkom' swindling clients

My initial agreement with telkom was a January big deal at R827 'price lock'. They decided to change that to R843 without my notification, due to some tariff change. I still, out of good faith, decided to pay R850/R870 eft every month . These guys didn't mail my invoice till after 10 requests, i will not know if the amount due is within my payment. With that being said they suspended my account twice in 10 days (between 25th Feb - 7 March) , which the last invoice stated that the amount due is on the 25th March. till today, i am still liable for R520 (2 x R260) re connection fees, and no agent has got back to me....just to add to this bull**** service provider; i am paying for a 10mb line, yet only receiving 4mb/s