Misleading and lying to customers

Earlier this year I took a contract for data with Telkom, it was for 15GB and R149 per month, when I took the device in store I was told that when I deploy my data I will get a notification on my phone or any connected device at that time informing me that I’m depleting my data. For a couple of months I was billed R149. Last month to my surprise I was billed R649, now my first problem is that there is no way I can deplete 15GB in a week, I mean even mtn 500MB goes longer than that. My second problem I never received a notification on any device that was connected informing me that I’m depleting data, had I received that notification I would have obviously stopped using the router and recharged my other reasonable network data. When I went to the store that issued me with router they still maintain that I was supposed to receive that notification but no one can explain why I never received it. So basically telkom mislead their customers so that you can get money out of us. In actual fact I want to be reimbursed my R500 because is it wasn’t for you misleading me I wouldn’t have had such a bill. I choose you because I thought your data was reasonable but clearly I was entirely wrong. I lodged this complaint on the 08th of October and was given a case number ********** 6. You never even bothered to attend to it.