Rewardsco - wrong phone delivered

I was called out the blue, the lady was very proficient (good sales s****) and I even checked the phone I wanted on the internet while we spoke. A phone was delivered about a day later, very impressive. But it was not the phone I looked at while on line, or wanted, and I requested to change it almost immediately. The person on the help line said that in 7 to 10 (or maybe14?) days I would be notified and it would be collected. From such speedy service to zero in one jump! I wanted a Samsung A32 4G as it has a higher rez screen etc, but got a A32 5G which I definately don't want as apart from 5G it is worse in every other department. Please let's resolve this ASAP.?