Rain WiFi continues billing even when router is cancelled and nolonger in use

Rain continues billing me for a router I cancelled and no longer use We took a Rain WiFi router for home use after being told there was no contract. Unfortunately, I experienced ongoing signal issues and contacted Rain several times for assistance. I eventually informed them that I no longer wanted the router. We then ordered another Rain device, which was delivered and is the device we are currently using and paying for. However, Rain continues to bill me every month for the old router, which is no longer in use. The outstanding amount keeps increasing despite Rain being aware of the situation. I was even advised that the old device would no longer provide network/data because it was not being paid for. Yet I am still being billed for it. Rain has also not arranged to collect the old router. I have had several communications with Rain regarding the cancellation. I am repeatedly told that a job card has been issued, but apparently under the wrong request. On WhatsApp, I am repeatedly asked to confirm the cancellation of the device. I have confirmed it every time, yet the billing continues. At this point, we are effectively paying for two routers while only one is providing internet service. I would like Rain to resolve this matter, cancel the old device, stop the ongoing billing, arrange collection of the unused router, and correct the outstanding charges.