Decorfurn are ******* & non ethical business

I recently went instore & made a purchase of multiple items on 16/03 & was told my order will be ready in 7days. No communication almost a mth later. Went bk to the store & was told my goods were credited. They reinvoiced my order & i pd for delivery & assembly. The Salesman invoiced the incorrect goods on the original order same product name diff size. I receive my order & the staff assembled the items & then only did I realize it was the incorrect items. Emailed the store & went bk & told I had to repurchase the correct items & head office will sort out the return as it was already assembled. I had to pay for a re-delivery & assembly even though not my fault. Today, I'm told they cannot give me a credit as the goods are already assembled. This is theft & against the consumer protection act. Decorfurn is a bunch of ******* & not an ethical company to deal with. No manager at the store or head office is willing to take my call or answered any emails. DO NOT BUY FROM DECORFURN.