On Air opened a new account on my name without my knowledge. Pathetic and doggy behavior

I was almost at the end of my contract with on air and out of the blue I received a notification on a new debit order that'll go off my account that I don't know anything about. I call their client care and the lady who answered my call told me that there's a new contract in place and asked if I spoke with anyone on the phone regarding this and my answer was no, when I told her that I want her to cancel the contract immediately because I did not agree to, she told me someone from cancelation department will contact me, until today I haven't heard anything from anyone.

Today I went to my clear score and realized there's a new On Air account listed on my account for an amount of R5700 that I absolutely know nothing about. It seems you guys operate your business by ****ming unsuspicious customers, your staff members are so desperate for sales that they take customer detail and open new accounts with their details to add sales, that behavior is pathetic and very unprofessional. Whoever decided to take my details and open a new contract will pay for it. Maybe they need a lesson or two about Popi Act. What a doggy company to deal with, this was the very first and last time I'm doing business with you. I want this attended to ASAP.