Poor communication and lack of transparency

Ordered a pair of sennheiser HD 4.40 from the website late on Thursday the 1st of February and payment was confirmed the morning of the Friday the 2nd of February. I was informed with the confirmation it will take 2-3 working days to get my order. On Tuesday the 6th I had not heard from anyone regarding my delivery so I decided to whatsapp audio mart to see what the story was. I got no response so I phoned and spoke to one of their employees who informed me the headphones had not been dispatched. The employee then said they were going to be dispatched on Wednesday the 7th and I will receive them on the 8th of February, which is today. I phoned audio mart again to confirm when they will be delivering my headphones and lone behold they say sennheiser don’t have stock and it will be 2 and a bit weeks before they do. Apparently they have known the entire time I’ve been waiting for my headphones that sennheiser didn’t have stock as apparently sennheiser sold their last pair as I ordered mine. I understand that these things happen but why did you tell me they were being dispatched when you specifically knew your supplier didn’t have stock... absolutely pathetic and I will never buy from you again. Poor form. They have offered to refund me. I hope I get my money back.