totally opposite to what advised

I dealt with Nomveliso at Cell C direct & renewed to a top up 30 from a top up 50 contract - as the price of the top up 30 was actually more that my old top up 50.Previously I was able to accumulate a maximum of 3 months benefits i.e.to 150 each of sms's, mb's + minutes.In one of my calls I specifically asked that with changing to a 30 top up the maximum Id be allowed to accumulate would now be 90 of each.On the morning of 29th March I checked my accumulated benefits status and it was as follows: 53mins, 47sms+150mb.I realised that this would mean that I would effectively lose 60mb of data because it would now be restricted to 90mb after the new minutes were given.You can imagine my surprise when the pro-rata benefits for 29-31.0315 were given to me - effectively 2 of each - suddenly my previously accumulated benefits were lost! I have called Cell C, gone to 2 different outlets, emailed them on many occasions. I've noticed that I've been given a R35 credit on my account-this does not compensate for cost of the lost benefits.The recording of one of my many calls to Cell C was played back to me when I asked the question mentioned above about the benefits and I was told I was correct