AWFUL and unacceptable service provider

Cellphone data is being used up regardless of whether the consumer is making use of the Internet or not. For the sixth time this year alone my data has simply used up in less than a day when I have NOT had my wi-fi/bluetooth/personal hotspot activated. I have not logged onto YouTube, Facebook, or Skype. I have simply checked the occasional email and chatted on Whatsapp (without any video or picture or voice note downloads). But yet an entire Gig of data is used up in 12hours. I phone customer service who were extremely unhelpful and refused to acknowledge any problem on the service provider's side at all. My problem was not addressed in any way - refund or contract cancellation. Service was pathetic and substandard. No one cares about the problem at hand or that I'm laying a complaint with their miserable service. If the contract is cancelled they require one to still pay up the remaining months left on the contract for the service that they are NOT providing. They have NOT met their service requirements that they assure you they provide yet one must continue to pay for sub-standard and pathetic service. It is unacceptable and immensely frustrating.