Bridge of contract and Paying for nothing

I have bought a bed and washing machine in November 2018 on account at Lewis Twin City Bloemfontein , the machine was faulty from the box and when i reported the machine i was told that the suppliers have closed for December, in January i made a follow up i was taken from pillar to post again until they collected the machine on 26 feb, i only knew when i made follow up that the machine had a problem from the factory and they promised to exchange the machine,till today i haven't received the machine, every time when i call for follow up its one story after the other, and what irritates me the most is that they keep quiet as if everything is normal and when i call them they always say i will get the machine before end of week, my account is up to date and even pay more than requested, my wife and I have been calling about twice weekly , spending a lot of airtime but we not getting any help at all