Content charges on my account

I’ve contacted MTN regarding unauthorized content charges on my account and was referred to WASPA who in turn referred me back to MTN for the name of subscription provider. After giving WASPA the info I was given they told be it’s incorrect and referred back to MTN. I have been told to dial the USSD number to unsubscribe, however on doing this it says I’m not subscribed to any services. My account is still showing the charges and has been for months now and I seem to be going around in circles. I NEED AN ANSWER and no passing the buck at my expense. If this is not resolved I’m taking it further