Pathetic Bed Shop

I bought a bed from the Cresta Shop about a year ago, the bed began to sage and give in before the two year guarantee. We notified the Cresta shop before the two year guarantee had lapsed andShop Manager Mr Mojalefa started giving us the run around and took us from pillar to post and back. They asked for a proof of purchase which we supp**** via our bank statement and then they just ignored us. Its been over 3 months of no action. They simply dont want to replace the bed nor revert back to us.