Poor service

This is totally ridiculous and very upsetting. I paid for an order and immediately realize that my home address was not used but it defaulted to my daughter's address. Spent 5 minutes trying to change the address and eventually phone the helpline who told me it was not possible to change my address. How is this possible in a modern intelligent setup? So now I'm going to have to send it all the way back and it's going to cost yourself more money instead of just changing the address which hasn't even been processed yet.