Data Monster

I have a contract with Telkom and for the first time since I joined them my data has depleted within the same day. I have no new apps or used it out of normal. Been trying to get through the call center since Monday but no luck to get through as I've been holding for more than 20 minutes everyday. Today I received an sms informing me of I have less than R100.00 o spend while I haven't used the phone during the day. I even went through the extend of closing my data on the apps but still data went off my phone. I'm thinking of cancelling my contract with you guys as I don't understand whats happening with telkom this month. I can't be paying R890.00 and not be getting the perks of what I'm paying for