Absolute ridiculous Cell C!!!

I have a data contract with Cell C and the 24 months contract ended in May. The contract was R99.00 for 5 gig data then early April I received a bill of R159.00 few cents more than that though. I immediately contacte them via email requesting details on the higher amount as Ive not even turned on my wifi and also requested that the contract get cancelled immediately as the 24months were done and I dont need it anymore. They told me that the contract can only be cancelled in May but I need to call another department regarding the increased amount details. Then 2 days ago I receive another statement due on the 26th of May for plus mins R199.00. SO from a 24 month contract of R99.00 in 2months time the amount went up to R200.00 and I still did not turn on the wifi router!!! Contacting them the guy informed me that even though he picks up a cancellation Ive been migrated!!! What this means he could not tell me and informed me to contact yet the 1st department i complained to a month ago!!! Another 2 days later Ive still not received any feedback or reply from Cell C!!!! Worst possible service ever!!! Also I still cant understand how on earth they can just chamge a R99.00 contract to R200.00 while Im still on contract! If I were to breach the contract I would have major problems but the were able to any not even inform me , absolutely ridiculious. I honestly hope that I receive feedback now and that I het paid back the money they "stole" from me. I paid my account always on time with never hassle so believe that I was a good client but Cell C is not a good service provider!!!! I need help and will never recommend them to anyone!!!!