Billing for a product never received

I purchased a laptop in March 2017 from the call centre sales representative telephonically. I got the laptop. It was wrong. Called them they told me I had to send it back via courier. Was resent, wrong laptop again. Had to resend it back. Waited a while, called again and. Eventually got it. The problem is that it was supposed to come with a router and 5 gigs of data. I have been calling and calling and calling since March. I always get told that they will escalate it and that I must not worry that it will be sent to me within the next few days and they will then credit me for all the months that I have been billed. I eventually sent an email to the complaints department last month. Still no feedback and still no modem or data and still no credit. We are now almost in December and I am still paying for something that I have never received. I am absolutely fed up with Vodacom. Worst call centre ever. You can never speak to a person who you can get it escalate the problem too. I get told all the time that they can see how many times I have called and cannot believe it is not sorted but then it gets left there.

Unacceptable.