Charged for Data I did not request

<p>I have been billed twice by this company for data although when I signed up I only wnated voice calls. They told me I would get an sms if I went over my amount for voice calls but this never happened. My sim is now locked and my service suspended because I did not pay for all this data usage. i NEVER REQUEST A CREDIT LIMIT FOR DATA. Why was I never informed about this prior to the contract starting</p>