Data usage

Goodday, I have the same complaint as many other users. I am a housewife who only use my laptop for emails and occasionally facebook . I have a contract for 2gig for R89. November bill R4956.96 and December R2958.55. I requested URL report and after waiting from November till now they said they cant issue a URL report older than 3 months. They today send me a CDR report that doesn's mean anything to ma. I stopped both the amounts on my bank account and now they want to take legal action. What must I do?