Cell C: Horrible year

Too be honest where too start, I took out an Data contract with cell that was on promotion for R359 a month and i have recently noticed that these oaks been deducting 400+ from me, so then i noticed that my bill limit has been increased again! Please explain to me where have i ever given consent for you guys to just increase my bill limit monthly ? Not only that have i requested that they keep it on 0 and it didnt even last a year before you guys go and increase it automatically ?

Please also do explain the following to me, from the start of the contract i have been using a Telkom prepaid sim card and got the Cell C 50 GB.

On Telkom when i buy 60GB data the data lasts me almost three weeks longer than the cell c ? this does not make sense in anyway and. Ten gb can definitely not take three weeks to finish.

The third complain i have is your internet is at times so horrible that i cant even stream a youtube video ( Please note this is not the first time i am complaining about this) I have had this fight with your guys last year as well.

Please note that i have had some serious issues in the past with you as of the last was my Router was faulty and you refused to replace it and after two hours of fighting you agreed to replace it. As talking to the manager she acknowledged that there was issues on the specific brand the RLT Cell C router and there has been recalls on it but it took me a friday morning to get it replaced with stories its needs to be sent to Midrand and fixed after knowing there is issues on it.

Please send me the procedure to cancel the contract as i am not a happy customer