MTN Fails to help a Loyal Customer

I upgraded my contract on Tuesday the 09 September 2021 via tele sales. On Tuesday the 14th September 2021 I received the phone via DSV and everything was done well. As I upgraded via telesales and not in the store I did not physical see the phone which was an I Phone 12 Mini and I was extremely unhappy with the phone. On the 15th September 2021 I then decided to exercise my cool off period and exchange the phone for an I Phone 11 and literally non of the MTN Stores wanted to help me during my cool off period so then why does MTN tell us about this cool off period when once you have the phone MTN refuses to help in any way of form? Please guy my view on the I Phone 12 Mini its ugly and out cute for a lady.

MTN please can you help me exchange this phone for the I Phone 11 as I've been a loyal customer for the past 12 years but I can not be offered any help???