Poor service and lies from cell c Agents

Cell C sales agent are lies, they would tell you anything just to make a sale. In March I took a contract phone with Cell C at Pan Africa Mall and I was told am going to pay R259 including insurance then boom they started taking over R300 when I went there to asked the manager she started telling me all sort of stories that she even said I can just cancel the contract if am not happy. I decided to let it because I didn't want a bad record then just last month I went to a different cell c store to take a data sim contract for R129 and was told they going to have to pay an activation fee and I was ok with that, come month end Two debits were taken and everything was fine or so I thought to my surprise cell c this month on the 26th at around 21h00 took R751. 61 from my account and when I went to inquire they tell me that they decided not to take all the money last month then double this month. Who's account is this mine or theirs? No one bothered to sms or call me to explain all this instead again am told the was a misunderstanding between me and the sales person. Now I ask myself is this how they are trained to lie to customers so that they can make a sale? I mean how can this be that two employees of the same company from the same shopping center make the same mistake and I have to understand? Am very disappointed with CELL C and its poor service