money loss on vodacom data

So I have a contract with Vodacom and I pay R400 for 600g every month. The router stopped working and I took it to repairs and its been two months now meaning i have been paying R400 for nothing. I cant even use the sim card on my phone because the simcard wont work on my phone. The store at Jabulani mall was credited because they couldn't fix the router.

Now what annoys me is that the store does not even communicate anything with me. I have been the one running around and they tell me we still looking for the router. I was asked to pay R700 extra which i dont have and at this point I feel like i will be paying R400 every month for nothing.

I need to cancel my contract until they get me a router.