they keep on Billing me even after cancelation

Hello Rain it was a great pleasure to use your 5G Wi-Fi but after I have requested to cancel in November 2022 that is when I realized the incompetence and poor customer service Rain has. I called the support department to cancel my Sim and the lady i spoke to said she has cancelled the sim and they will send someone to collect the Router. I have been waiting since Last year (2022) November for someone to come and collect the router, but no one arrived until yesterday after numerous calls to your Call center. the bad part of it is that Rain has been billing me even after cancellation I have been calling to ask you guys to stop doing but no one listens instead I am being told that my request will be escalated to billing department for a refund. four Months later I have not received my Money that you took even when I have canceled and never used your router since November 2022.

Can someone from Rain do a right thing and refund my money and stop billing me for cancelled Sim.