Package lost and refuse to refund

I ordered a Weber braai as a gift for my husband’s birthday which is on Sunday, 6 Sept. The delivery date was advised as 3 Sept. I kept checking the entire day on order updates to check when it will be delivered, no updates. At 19:00 last night I get an email saying my “replacement order” has been processed and will be delivered on 8 Sept!! I kept trying to get hold of someone to ask what was going on, no luck! Eventually sent an email and get a response oh we are sorry it will only be delivered on 8 Sept. I then explain its for my husband’s birthday on 6 Sept so that’s not going to work for me... I then ask to cancel and please can I get a refund. The response - no sorry your order has already been processed!!!!!! I asked the lady to escalate as this is unacceptable, her reply “please rate my service?” Seriously??? I then get an email to say that my parcel was lost in transit but not to worry they will deliver on 8 Sept!!! They lost the package, then changed the terms of the transaction (unilaterally without me agreeing to a later delivery date) and now refuse to cancel the order??? And no one seems to think this is an issue? My husband’s birthday is on 6 Sept!!! I cannot accept delivery on 8 Sept, obviously! I just want my money back (R4000!!) so that I can go buy the braai somewhere else. Shocking!!