Rain is nightmare with false adverti*****t

So I canceled my rain subscription as I couldn't afford it anymore. To my surprise none of the consultants I spoke to said anything about having an option to return their router instead I was given the option gor collection. Till tday the router hasn't been collected an I apparently owe Rain R1260 which is for 2 months that I've switched my network mind you it's only been a month of using a different Fibre. So Rsin please enlighten me how I owe you for a router I haven't used. The contract was month yo month now it's suddenly a must that I pay even when I don't use the router????