Unhappy customer

My name is Lizwelihle Moledi, I topped up with R300 this morning and when I checked my balance it is now R110.53, I am on contract so I cant do airtime or data advance, I dont have out of balance services or any subscriptions, I called the call centre with no joy , told me I have to wait 72 hours, so for 72hours I wont have data or a solution, the only thing they can tell me is that I need to consult my bank, so the blame is being shifted to my bank. Before I topped up I only had R0.53. All i want is my R190 back so that i can by data and continue with my life. Once my contract ends I wont even consider stay with mtn..one problem after the other. My cellphone number is ***. Hopefully I will get assistance.