If I don't pay for service, what do I pay for... Contract?

I'm dissatisfied with rain internet service first it only works for 30min and struggle with conectivity for the rest of the day, you try to cantact them they are nowhere to be found. When you try to cancel the site doesn't give you options to do so until month end and you realised that you been billed without using even a kb, when you finally find a way to deactivate and you think your nightmare is over boom another debit, second month in succession you are being debited without using their service. When you finally get hold someone you being told that you canceled in August but effect took place 1st of September and they continue telling you that they don't charge for data used. I'm not satisfied with their service hope people will know about my experience and learn from it. Nothing is hurting like being taken for a ride for the money you worked hard for it.