Laptop dropping connection to MTN network

Took out a new contract for a laptop just over a month ago. I have experienced some problems with the cellular network disconnecting randomly whilst using it. I took it to a MTN store in the Mall @ Reds. They had issues opening the sim slot and eventually got it opened. Tested the sim in a cell phone and declared the sim to be working perfectly. I told them I believe the issue is with the laptop but they could not help me with it. They told me to call the call centre. Which I did. After speaking to 5 different people who did not seem to understand my issue they tried to get me to take it to a store. I told them the store would not take the unit in for assessment. Eventually someone told me that they will have the laptop collected. It has been more than a week an I have not had any collection take place.