Bad service and Lack of sincerity

I did with Mtn a dual contract, I was suppose to receive data and I did not then I visited the branch 4 times and their service was poor including the managers stating that Data will be load by the 20th and that did not happened then today they tell me that Data was loaded and I used it. Which is impossible as no one @ home to use it and everyone have their own Data in their tablets. I was visiting them regularly to fix this mess up and they now claim Data is used already and they can't even provide proof of that Data. I'm a very unhappy with this matter and I need my data to be reimbursed.