Telkom is robbing me.

I recently opened a contract with Telkom it’s suppose to have an unlimited internet usage. With 50gig full speed. And then throttle down due to fair usage policy. We where then told by sales person in store after signing the contract online it’s not 100gig full speed but a lesser amount. Non the less every month when my data and min are restored. Telekom robs me from half the data. For example on the first day of new month my Telkom app will say I already used 15gigs or 10gigs. I called the call centre and they said ow I used the data. I said it’s impossible as I downloaded nothing. Due to internet policy they can’t disclose to what sites was used. The next month I switch my phone off the night of the last day of the month and the same thing happened half of my data was already used when I turned phone on, on the first and they couldn’t answer me when I said well I turned my phone off so how could it possible download 15gig from the time I turn on my phone to the time I open Telkom app to check my balance. I then stayed up one night till after 12 so I could see if maybe it’s a possibility something is eating the data after it was top up for the next month. but minutes after the new month had started I had already consumed half of my data in a matter of seconds. So now what’s even more funny I was out for the country for 2 months my SIM card was out of my phone. Phone wasn’t on roaming, there is no way data could be used and when I returned home yesterday inserted my SIM card 15gigs was again used. So what is the answer? Telkom is basically robbing me.nobody wants to help on the phone or when u go in store they call the helpline and put you hold for hours which one person transfers you to the next. Telkom is robbing me in broad daylight I’m paying R1700 a month for a service which I don’t get. And guess what i can’t even cancel the contract, I have to pay in a huge amount. I even have screen captures of the date and time of each month where new data is suppose to be allocated. But Telkom says no u already used 15gig in a matter of 5 seconds how’s that even possible. If you don’t believe me I have my boarding pass the the time the flight landed and the turn I turned my phone on to the time I checked my Telkom balance via the Telkom app is all available and obviously doesn’t add up. I want my money back please