Subscription cancellation.

I have had enough of Rain Internet Service Provider! A couple of months ago I requested a consultant to cancel my subscription since I wouldn’t be using their services anymore. I even informed the consultant about the charge on my account and told them that I won’t pay for it because my sim had been inactive for about a month. And the last time I checked I did pay them for the outstanding payment prior to that. They have been charging my account for months now for a service that I am no longer using. I have been calling their call centres and all they’ve done is put me on hold! Last week I sent them a Facebook message and they said they’ll get back to me till today. I want Rain Internet Service Provider to stop trying to deduct money from my account and they must cancel my subscription as I have already told them months ago. I can’t even have money in my bank card because I am afraid that they’ll deduct money from it which they aren’t supposed to!