Good Response to Complaint gone to Waste

I have never had a situation where I have had complained against a company, then praised them for the way they handled my complaint and now having to complain again because of poor service and false promises.

I had proved that I was entitled to the Clear view cover and S pen with my purchase of the S21. I was given daily updates about stock availability and eventually told my order was shipped. What I received was the incorrect item - just a galaxy tag. Upon follow-up I was told they were investigating but have received very poor interactions since then.

What makes things worse is that friends who never complained and never expected the cover and pen have received theirs already