Misleading *****ing customers money!!!

I have opened up a contract on Saturday for the very first time I feel is extremely wrong to misleading clients the consultant advise me he will put a lock of R11 on my open line contract my package was for R499 + R11=R510 I said its fine he ensured me that the lock will not change.. I called the Vodacom customer care yesterday 21/07/2015 and I spoke a lady last night she told me I have used a R66 out of bundle I told her It cannot be because my threshold is R11 she said no there is no log on your phone I have ask for the log she as well ensured me that she will log it on R66 she cannot make the log less because I've used the above amount. Well today I spoke to one of the agents and she advise that she will put the threshold on R50 but if I still continue to make calls theres a possibility that I might pay more! What I don't understand is why Vodacom puts a threshold for call,data,sms for a client not to exceed but they doing the opposite adding amounts that customer didn't sign for is totally unacceptable ******** service I regret taking out a contract with Vodacom and I am not happy with the device the shop in Maponya said No they cannot take it back