Cancellation ****.

I was told that I am postpaid. While I paid the full amount before joining, so for me it was more of a pay forward and get service. Not a use then pay. Now i sent my router back on the 8th of April but I am being charged fully for April. I feel ****med. I am not being charged what I used I am being charged for the whole month and it is not correct. Rain has became a ****. I did my investigation if you need documents to and emails to show you that I paid the full amount on the 26th of Jan 2023 then i received the router on the 02.02.2023,when did i change to postpaid?????????

Phone calls are not being answered. Emails are not being answered. Whatsapp tell you to go to the app or call the number.

I don't think I have to pay again end of May meanwhile I am not on postpaid. I have all the emails , invoices and proof of payments.