Bad service

Good day

I have contacted DTSV via email on 20/02/2018 and then called again the 22/02/2018 to confirm with them what will the amount be if i take the special of R599 , at this point the consultant informed me that the special was not loaded onto my profile the matter must be escalated i then received a call from the manager on the number ********** 000 of which he said that because i only upgraded the 3/03/2018 i no longer qualify for the special but i wanted for them to escalate the matter and then inform me the amount i must pay ref numbers is as follows ********** , ********** , now after all of this they are telling me i no longer qualify for the march special, i think this is pathetic and now i owe them R336.62 because i do not qualify for the offer i paid R610 and another R120 of which the total to upgrade was 769 , i paid 730 more than the prorata now they saying i owe them i want this amount to be reversed and i want the special on my name ! I mean why do they send me an sms to say i qualify for the special of R599 but then yet it is not loaded on my profile i have spent endless airtime .Do i ask them money back ???