Bad service and frustrating

I wish to express my disappointment and frustration that RAIN is putting me through, I have sent an email to cancel with RAIN because I am moving to another service provider (reasons saved for another day) someone called me while I was driving I requested a call back when I reach home, and I sent an email to say I am now available on a call, that was my response on the email that was sent to me saying I should inform them when I am at home, of which I did not receive the call, yesterday 27th Jan i checked my app if maybe there are any updates I realized that I have a bill for the 15th Feb which is the dates i normally pay, I sent an email early for that reason ( I did not want to pay anything with Rain since I am moving to a new Service provider 1st Feb) so now when I called RAIN this morning I cannot get clear explanation as to why am I billed for 15th Feb whereas I sent a cancellation, with my small understanding I though its easy as they say on adverts to do the cancellation with them. So for those who join RAIN because they think when they want to cancel it will be easier think twice. I wish RAIN to resolve this issue as soon as possible.