Kurl-On — angelica spring mattress is very uncomfortable and giving constant back ache

Address:

411014

We bought a King size angelica spring mattress about 45 days ago. The issue is that the mattress feels very hard, unlike how spring mattresses feel (we have another angelica queen size mattress and it is different from this one)
We have had constant back pain. We tough we will adjust but it has been 45 days now and the pain is still there. We had bought another curl-on mattress (angelica queen size) that is much less firm and much more comfortable. The company has either sold a defective piece or the dealer is selling Fake spring mattress. whatever the case we would want a replacement.
I called their customer care number provided on the warranty card but whoever picks the phone cuts it off immediately.