Wrong size delivery by Furniturespot.

Recently bought a king bed, and they delivered a king extra long. Contacted them twice and was promised that the problem will be sorted out. Store manager called and made a promise to come back to me. Still waiting, no contact has been made. I actually explained to them that the reason why I bought a standard king bed was because I already bought a king mattress. As it is now, I'll be forced to incur an extra cost buying a new mattress to fit their bed, or else I'll have to live with a bed which has some space at the back, because the mattress is short. In addition, I'll be stuck with a mattress which I cannot use or be forced to purchase another bed which will fit the available mattress. And by the way, the available mattress costed me approximately R12000.