No packages top up

I upgrade my contract about 4 months ago to the S6 I received my full start-up package as per the new contract agreement. However after that nothing... I have called in to speak to a Mtn consultant and the response I get is I can't help you but I will get my supervisor to call you. I've even been to the store I get the same response. This has been going on for the past 3 months were I haven't received my data or sms as per my package. I'm currently paying full price for a service and not receiving everything as promised when doing my upgrading. That 3 months that I've been billed for talk time data and sms but never received the data or sms. I need this resolved asap. This can't keep going on like this. I'm feed up on either going in or calling in with this complaint as the response never changes. I get my supervisor to call you that never seems to call back.