Billed for a Rain one that is not used and cancelled

Exactly a month after I complained about the Rain one that I am being charged for but not using, I was billed for it again. The device and its simcards were collected from me but I’m still charged for it. I am getting tired of this and quite close to cancelling everything with Rain. Please reverse my money. Do not tell me about the processes it will have to take for me to get my money back beca Your systems failed to see that it is billing me for an unused product.