Rain bad service

I need your help with Rain Go service provider; I am not sure if this would be the relevant place to come to. They have deducted money from my account; I am being billed for the service that I am no longer using. After numerous conversations with Rain over Whatsapp. Last year, I have been asking them to cancel their service and schedule a time and date for their router to be collected. I have been battling with them. All they do, every chance they get they just deduct my money. They billed me up to 3K. I have asked their consultant to send me the usage, and she mentioned that she cannot see that, and according to them, their service is active whereas it's not.