Bad Service

I bought two 3D printers from the above company on the 28/04/2020 after confirmation via telephone call with Ros, she said there was definitely available and that all that needs to happen is payment. I did an immediate payment, and it was confirmed that payment and order was received. On Monday 04/05/2020, I got advised that they don't have any in stock and a refund will be made. After phoning and emailing Ros numerous times as the money had not reflected into my account, she kept advising that payment was made. I got fed up on 07/05/2020 and spoke to Annie in accounts department and she also advised payment was made and there could be a delay via their online merchant, whom I called as well. They advised me to call my bank and see if there are no delays there. My bank has no knowledge of this payment coming in. Why do I have to call and run around to get my refund when they did not do their jobs correctly? I have a business to run just as they, and now I am being delayed due to their incompetence and I just get told by everyone payment was refunded. Unpleasant experience, and I will not buy here again and will also advise my friends and family of this so they don't end up in the same predicam