Schedule a service call so they can have a look at the issue. There should be no disconnects. There is clearly an issue. Log the dates and times it happens so the tech can have a better idea of what is going on when he comes there. Schedule a service...
Did you follow the steps located here to start the process. At the very least suspend the service. You can use *611 to speak with someone to blacklist the IMEI or chat or X @TELUSSupport