Bad Service

I have made a layby for Sealy bed just before Covid,I think February or March. I have paid it in full but I do not like that bed infact I did not like it even then but what I liked was not available. When I went to the store to complete my Layby the bed I like was available. I told them I want the 1 I like but its less with R1000 than the 1 Ive ordered. They can give me the difference of R1000 telling me to buy something with it. Its my money after all and I did not take the bed so why I'm forced to make another layby or forfeit my money