Got the wrong bed

I bought a bed on a lay-buy and finished it on the 30th May 2015 and they made a delivery on the 31st following day,it was not the bed i bought so the manager requested it to be left at my place and they will fix the problem the following day but never did when i call him he always says he will call me back to fix the problem but never do am stuck with the bed i did not choose.I bought sealy they gave me sleepmaster.i went to the store on the 15 June 2015 and the manager told me they Will deliver it the same day but never did.please help.