No internet on Home router and I can't reach MTN

I app**** for a home router on the 8th of August and as its a prepaid deal, I paid for a full month in advance plus pro rata for the month of August. I only received a call from DSV on Monday to arrange a delivery for Tuesday. Tuesday the 13th, i received the router and sim card and it had no internet. Tried calling 083135 and then got through an option to call *** for new contracts. Since i was calling from a Cell C number, it says I'm not calling from a valid MTN number and the call was cut. I went through to the facebook page and sent a message and was told the sim need to be Rica'd by DSV and it should take about 24hours. Yesterday, around 4:45, i checked again, the router still had no internet. Messaged the MTN on facebook and they said the sim has been rica'd and I said there's still no internet. MTN then responded to say the network issue has been sorted, i must switch the router off for 2 hours... 3 hours later, there was still no network. I left it off the entire night and this morning again, no network. I need a number that actually works so that i can call and cancel this. I paid pro rate for the internet that doesn't even work. I need to return this unit and I need a full refund for the money that I've paid. i will try other service providers because i can see that one day when i have an issue, I won't know where to go or who to contact as MTN only takes calls from MTN numbers. If you call from another network provider, the call is cut. I need someone to call me to arrange collection of this unit because I've had it and i want my money back