Who I have the same questioned this topic

I received an offer under My Offers about $400 off a new Iphone X. I went to the store and upgraded 2 phones under this offer. A month later I upgrade 2 more phones on the same offer.  2 months later I get a really expensive bill. I called Verizon and they said the first 2 phones I upgraded, I am not getting the promotional offer but the 2nd two got the offer. I called Verizon and spoke to the Loyalty Team. They basically said  oh well on the first two phones and did not care.They said there is no way to find any history for any offers. False advertisement. I've been a customer for over 20 yrs.