Shocking Service

I ordered a pair of crocs on December 15th 2020. When I received the order, I realised that I had ordered the incorrect size and contacted Crocs SA to find out how i could swap out the item. They advised that I would have to pay R70 in order for them to collect the incorrect pair and they would at the same time deliver the pair I needed. I paid the R70 and heard nothing back from them. In the beginning of January I contacted their head office and someone was very keen to assist. They had asked me which pair I needed replaced. They then came back to me and advised that they did not have the item in stock and asked if I wanted a refund or swap for another product. I told the lady I would go back to their site and check if there was another pair I would like to get. When I was ready I called back but the lady was not available and I have been waiting ever since for an answer. I called the head office twice and cannot get through to anyone. This is rather annoying. I am immigrating and am going to lose out on the cost of the item along with the R70 I paid to have the pair collected. Shocking service.