Paying for an item I dont have

I want to ask hello peter for help with my Cell C contract . I took out a contract in Dec for the galaxy note 5 gold ...4 days later it went demon and the screen was black and blue I took it back to the store and they sent it in... <br> I got word it must be replaced.... and i am still waiting till today because cell C Kollonade dont have gold only black. Now i signed the contract based on the gold and they telling me sorry no stock am i sure I dont want black because they dont know when there will be stock again. And everyone knows you cannot cancel a contract because once u sign u are liable... The problem is I am paying for 6 weeks on something i dont have and have no idea when they will have stock. And all the store says is sorry but u must still pay... but I am already paying dearly..not just my instalment but my petrol to enquire within the store every week since early December. I have 4 other contracts with Cell C and have not skipped one payment...plus they sent my phone in with a brand new screen guard and phone cover, possible no replacemen<br> I am so frustrated because the customer care says they dont deal with store items and the store said phone cutomer care if u want to co