Wrong information given to Client

I was in the process of canceling my contract,when an agent called me and asked me to please not do so and they will assist me by extending my contract with the same monthly fees,with me keeping the router and just receiving additional 5 gigs free both day and night. on the 26th April i called into the call centre at 9:50am to query why the invoice i received was R190 and not my normal R99.I was informed by the agent Bululeco that it will change to R99 pm as the invoices normally do at month end and I will only be charged for the R99. Well that never happened and was told today when i called in and spoke to Sandree she asked me if i received any sim cards or anything like that,to which i did not ,all i have is from the previous contract and nothing new. She tells me that i was not discounted like normal...i want to know why,i was told R99 pm by the call centre as well as the guy who called me and persuaded me not to cancel my contract in the beginning. I have been asking for my contract copy and to date still do not have it.....more stories are given and they expect you to call in and request it from the legal department.I don't see why it was not sent to me initially. im fed up