Euro Bath & Tile not paying my refund

We bought 3 basins at Euro Bath and Tile in Centurion. When the plumber took out one of the basins to install on the vanity it cracked into 3 pieces. When we inspected the other 2 basins we realized that there was signs of them being glued in certain areas. I took the basins back to the store for a refund. I was advised that they will only refund me for the 2 basins. It's been 3 weeks now and I am still waiting for the refund. The excuses range from " its the banks fault, to we are waiting for authorization from various departments. The store sells low quality products and their customer service is very bad. Even considering legal action to get my R 4000 refund because they are coming with different stories every time we contact them regarding why my money has not been paid back yet.