Donna online shopping, pathetic

I ordered sandals online. I received my parcel yesterday. They had packed 2 of the same leg shoe. I went to galleria store to try and exchange it. They did not have stock. They called another store to have it sent to chatsworth foshini store. I then asked the lady to please ask them if it will be a problem as they are not a donna store, she called the store and spoke to someone incharge. They then said i must come and collect it but they will put it through as a new purchase as they cannot be stuck with a shoe like that and it is not there problem to keep a shoe like that. I am very frustrated as my account is maxed because of all my purchases, so my shoe will not go through as a new purchase. This is a very big inconvenience as i ordered the shoe awhile back and needed it for the week. I have a good record with the foshini/donna group. It is really pathetic service and a very big inconvenience which they really need to resolve.