Over a year and problem still not resolved

In the beginning of last year we bought around R300k worth of tiles from Italtile Bryanston for a complete home renovation. It took several months before we started tiling, and soon after it started we realized that some of he floor tiles supp**** to us were the incorrect colour. The problem is that the incorrect colour is mixed in with the rest of the batch, so it’s not as though we could just pick out the wrong colour based on batch codes. We alerted Italtile to this, they came out to inspect and agreed that we should keep aside all the wrong colour tiles and once we’d finish tiling they’d return to collect them and give us a refund. We kept them all aside, and months later once we’d finished tiling we asked them to come collect. After many times asking, they finally scheduled the collection to happen at the same time as a delivery. Unfortunately the delivery man refused to take the tiles. After many months more asking for the tiles to be collected, I eventually loaded them up into my car (not ideal) and took them in myself. A few days later and I was told that a credit was being processed. This was over a month ago. I have sent numerous requests for feedback and have received nothing. I’m sick and tired of having to deal with this, and just want my money back.