Telkom, data *******!

I am absolutely unhappy and disappointed in Telkom. I'm a new contract client with Telkom and I hope I won't regret it last week. I have the 80GB contract with Telkom and I must and it is depleting rather too quickly to say the leaston. Last week in April the data was finished very quickly and I let it go. Last month for the month of May, again the data was depleting quickly. On Saturday 23 evening May we had 7.2GB data. Now when we are not using the wi-fi router, we switch it off. On Saturday when we woke up it was around 5GB. I paid no attention to it, I thought maybe it's because I had gone to Twitter and Facebook. On Monday it was around 3GB, I enquired with Telkom on Twitter and told them that I was also being charged when I do to My Unisa even after we were told thar we visit the UNISA website for free. On 27 I had 0.00MB remaining someone called me from Telkom and tried to help me with UNISA and asked me to send the UNISA link to them, and I asked for a detailed breakdown of the usage. He told me that it's showing that we were using the data at 22h30 until 23h55. But the thing is we were sleeping that time and the router was off, so who has been suing our data from the Telkom while we were sleeping. I requested that it be escalated, I haven't received any feedback. Today is the first again and I'm wondering how long our data will last because someone is clearly *****ing our data