refund for defective fridge

I bought defy fridge from ok furnitures in Butterworth on the 18/09/17, 1st week November 2017 repaired repaired by defy agent , last week november 2017 presented with same problem and i reported. it was not attended to and on 12/12/2017 I met the manager, to whom I requested to return the fridge for my refund, because to me it's not going to last, I can't invest my money buying a new fridge which is according to me these are the signs of factor faults. the manager told that we can only talk of refund when I return the fridge. I returned it on the 21/12/2017 and left my banking details, up until now, I have not received my refund. please assist I'm desperate for my refund, want to buy new fridge that will be in a good working condition, but definitely sure not from ok furnitures as their customer services I can rate to zero.