I recently moved from downtown Toronto to Brampton. While I had no issues with reception while I was in Toronto, the signal is very weak at my house in Brampton. I have to literally stand near the main door and answer my calls, if and when I attempt to answer a call from any other location inside the house, the call is patchy and connection fluctuates like a yo-yo!
We offer a pretty strong LTE network connection for the Brampton area. You can take a look at our coverage map right here.
We cannot always guarantee the best quality for indoor reception as there are many variables that may be interfering with the reception.
Did you get a chance to try a manual network search from your phone? Another good tip to try in these situations would be testing the reception on the 3G network instead of the LTE.
I hope this helps.