MTN 5 G Package - hopeless

Madam I recently purchased an MTN home internet package from the MTN shop in Canal Walk. It was purchased on the condition that if I did not receive the 5G signal I would return the package. I was assured of that by the sales person. As it happened I was not able to receive the full 5G signal as promised. On consulting the store I was told to call the MTN coverage section which I did. The lady checked the service and informed me that the signal was very poor in my area. I requested that she send an engineer to solve the problem but was told that this was not possible and that I should return the package back to the store. I did this within seven days. The store personnel were not able to process the cancellation as they had not done one before. I was told to leave all documents wit the customer service lady and that she would process it later. She couldn’t provide me with the copies or the receipt and the contract because the printer was not working. I therefore took photos of all documents and left her to deal with the mater. This was on the 28 th of September. I complained to the Store manager (Ms Tanya Johnson)After several visits and phone calls I was informed that I would not get my refund as I had used 75 gigs of data.No details of usage have been provided to me. I cannot understand that much usage as there was hardly any signal. The whole month has passed and still awaiting my refund of R. 932 that I paid upfront. I wonder how many more of your listeners have had similar issues. I do not know who else to turn To!