Sweet dreams furniture

We made a lay buy for a couch in December 2024. We were told that we could pay our lay buy over 6 months and that they would keep the price the same as the 3 month lay buy (we were happy about that).One of the guys working there told us that when we pay the last payment, we will be able to choose the colour we would like. When we paid the last payment they only disclosed then that a payment of R500 needs to be paid for them to take the colour. I still do not understand if they couches would only be made from after the last payment then why does one have to pay R500 "to change the colour". We were also told the couch would be delivered on the 2nd of May 2025, we have not received anything to date and nobody has called us to advise what is happening.