Store refuses Warranty

I bought a top of the range bedset from Dial A Bed Southgate on 11 July 2014 cash, costing near R10 000. The base of the bed is manufacture of inferior thin plastic. This has been breaking, and I reported it to the Branch. The Branch informs me they cannot assist with the warranty as the original Southgate store closed after the African Bank debacle, as well as system changes. They cannot trace the transaction nor take the matter to the manufacturer as they cannot prove the purchase of the product. I unfortunately cannot find my copy of the invoice, but I do have the bank statement that reflect the purchase of the bed. The branch is not even interested in assisting, as it is not them that sold the bed. The original Southgate store closed and stuff you the client. Cannot get hold of anyone at head office or the complaint department. Guess we now have to go the legal route.