No response regarding cancellation/collection/refund

I have purchased Rain 5G Home Premium on Nov 4th and received the package on Nov 6th, however, the connection is not good at all, unfortunately. I had requested cancellation on the 7th and today is Dec 1st but still, no one from Rain has contacted me regarding the collection, deactivation, or my full refund. Have made numerous calls and replies to the ticket logged but escalations are doing nothing.

Please call me to cancel and collect the router, or should I block payment and sell the router?????