********** billing unresolved

I have been **********ly billed for a mtn contract over a period. Matter is ongoing over 2 years and unresolved When I queried it I was incorrectly handed over to collections companies twice. They closed their file when I showed them queried accounts with them directly. After a year of me thinking it resolved I was contacted by a second collection company. Again as frustrating as it was I sent through the correspondence querying the account I did not open. To date I have to follow up for feedback and it's unresolved. Then I notice again third time I am **********ly being billed over the last couple of months by mtn for r160.00 and I don't have a mtn contract. I am concerned and this is *****. Their customer service team is unhelpful and you get pushed from one department to next and they never communicate or respond to emails or calls. I am so frustrated and I never opened any account