Terrible service and quality of product

I bought a Serta queen size bed from Dial-a-bed at the end of 2011 for around R 8000. The bed started sagging at the beginning of 2014. I have since tried to get a warranty claim sorted out with no luck. I have sent multiple mails and spoken to a few people, but still no answer from them as far as cost to repair/replace the bed.<br> Absolutely terrible service and quality!!