HIFI Corp Online and JD Group Experience Is Horrifying

I ordered a laptop online and received the incorrect product after waiting the full term for delivery. Then on complaint i was told i cannot/should not exchange it at a branch but deal with the online dept. I did this and communicated as best possible. I am still waiting for a response as how to go forward. The stores refuse to exchange it and say i must do it online. I now have the incorrect product and no joy so far. I am disgusted by this lack of care.