Mtn Canal Walk Upper Floor "Bad After Service"

I opened a contract at MTN for 2 x Nova 8i at MTN Canal Walk "Upper Level" When returning home I opened the the one phone just to find the touch was not working. I also requested a black & silver phone but the salesman gave me 2 black phones. I returned the phones the next day, salesman said he would cancel the contract. I then opened a contract @ MTN Vangate Mall I received 2 Honour phones & a laptop. I was billed for both contracts but I don't have the first 2 phones. "R1810. I stopped the debit order. I refuse to pay this amount. I was promised this problem will be resolved, it's been 2 months already. My current Sim cards has been blocked due to non payment as I refuse to pay for 2 contracts as I only have 2 phones in my possession instead of 4.