Vodacom - Poor Service

I was contacted December 2018 with an offer for an upgrade on my existing line with Vodacom. They were to send me a Wifi Router. Both the sales lady and Manager assured me it would not be a new line but only an upgrade to my existing one. But a new line was added to my account and have been paying over R200 a month since. I have phoned numerous times to complain only to be told every time that the call recordings will be listened to and someone will get back to me after 14 days. Still waiting...