hacking & loss of data

I have a contract that provide me with 10GB anytime data and 10GB night time data. I do not download large documents, movies, music etc. I only use my data for surfing the net and for my kids (aged 7&9) to play online games. my average consumption was barely 1gb per month. In recent months, I have realized that the speed with which I surf has becomes extremely slow. this is because all of a sudden my consumption has sky rocketed to above 40gB/month. I went to the branch in Tygervalley mall on the 11th July but they could not help me. I was advised to contact the call center. they were of no help either and advised me to email the ***** dept & change my DSL password which I did. there has not been a response and my data continues to disappear. I phoned the call centre again on the 30th July and the agent promised to send an email to ***** dept from his side and forward me their response. Still they are mum.<br> This is pathetic that I am not getting assistance from Telkom. My account number is ***