MTN authorizing data share without customer approval

I have had an issue with my data contact since July 2017, I lodged a query and never received feedback. I had the same problem issue today... received 10g data on the 14th and it was finished today(20th). I called the call center and was told that my data was on data share to 3 numbers that I did not approve. The data share numbers were loaded in July without my approval. I was told they could not tell me where or who loaded the data share. This is nonsense... I want an answer and refund on all date that was data shared.