Terrible service

I bought shoes online and on the same day i asked them what i can do if my shoes arrive and it does not fit, if i can then go exhange it for a different shoe and they said no as there are no teruns or exchanges on the sale items. I then on the same day requested for them to cancel my order and refund me. I got an email to say it was cancelled. Yet thet shipped it anyways even though i cancelled and asked for a refund before it was sheduled for shipping. It is irritating that i cant go to my nearest shop just to do a simple exhange if the right size. Ans it was also not right of them to ship anyways as i cancelled on the same day as i chose to rather go shop in store