Cancellation refusal

I am not happy with Rain at all!!!!!!! They deliberately refusing to have my second router cancelled!!! I had asked them a month ago to take and cancel the plan of my old router and they even sent confirmation I wanted immediate cancellation but they told me I had to wait until the end of the month I said ok I have all the details and called in again to confirm the cancellation they said yes even sent me an email to confirm!!!!!! Tell why today these ****ers debited money from my account when they shouldn’t have!!!!!!! They took money for 2 routers and added an extra charge I don’t know where the hell it comes from when I had simply requested a cancellation a long time ago. I want a full refund they must just cancel both of them right now I don’t want their stupid network I’ll find another provider!!! I am so ****ed!!!!!