Disaster online store and hugely inconsistent sizing

I am a loyal Salomon customer, having bought their products for many years, but I am now having such a bad experience with the online store. I ordered a few things for my husband and myself, in the sizes we have been wearing for years. When the order arrived the sizing was so inconsistent, some things smaller than normal and some things bigger than normal, that I had to send half the order back. I had to follow up multiple times with the customer service to get the exchanges. They don't even have an exchange or return facility online, you have to email the customer service. When the exchange finally arrived it was only the one product. Then I was unable to get hold of the customer service, again, to find out where the rest was. Eventually after many tries my husband got though on the phone and asked for a refund on the expensive item that had not been returned to me. After a week I received the refund minus R209! Now they are not answering phonecalls or emails. I paid R2799 for the item, which it clearly states on the invoice. But they only refunded R2590! I'm at my wits end and don't know who to contact to get my full refund. Why is this online store such a disaster?