Bad Customer Service at UFO Furniture Shop Kolonade Pretoria

I recently purchased 2 x queen sized beds from the UFO furniture shop in Kolonade Pretoria. I paid for the beds Cash and arranged for transport to fetch them on my own. The beds were delivered to my house that I recently finished building and am not currently staying in Moloto in Mpumalanga about 50 kms out of Pretoria and it costed me around 1200 to transport the beds. Everything was going well then, but after about 2 weeks later when I visited my other house I discovered that they had given the driver of the delivery Van that I hired a wrong or smaller base on one of the beds. I immediately called the shop and explained the situation about the beds and asked them to supply me with the right base. The shop did not show interest in assisting me anymore, they refused to bring the correct base to me even though it was their fault to supply me with a wrong base and told me that if I wanted a right base I would have to come over with the small one and fetch the right base. We failed to reach a common understanding because I thought that it was the Shop's responsibility to correct the mistake they made by bringing me the correct base to me but they didn't want all they kept saying was that they don't have transport and cannot cover the cost of transport if I send the guy who delivered the beds. I also wasn't going to pay for it since it was the Shop's mistake. They kept quiet and every time I was the one who was making contact with them. Eventually I decided to bring back their beds for a refund which were still sealed and never been used back to their shop using the same driver of the delivery Van I hired to fetch them from the Shop when I purchased the beds. I communicated with them and told them that I was returning the beds all together since they could not help me with my query regarding the wrong base and the sales person who assisted me told me to bring them together with the receipt and proof of account and copy of my ID. Upon arrival at the Shop they refused to take the beds and one of the worker for UFO assaulted the driver, the driver went and open a case of assault against the worker who had assaulted him upon his return from the police station accompanied by the police the Shop decided to take back the beds and the driver and Police made them to inspect and sign that the beds where in their new condition and no damages with the beds. The problem is now they won't refund me. I have waited for the whole week and now in the second week and if I don't make contact with them, like before they will not communicate with me regarding my refund.