Device Payment Plan Credit

I went into the store almost two months ago to upgrade three phones to take advantage of the trade-in program for the iPhone 17 deal, and I was told that I didn't have enough credit to upgrade the third phone. Long story short, I've been in and out of the store and made several calls to customer service, and no one seems to have answers. Corperate even told me that if I waited after 10/11, I should be able to increase my credit. My credit is near perfect, and I am never late on payments. The store manager will not return emails or calls. I've been patient, but now it is very frustrating because I upgraded all 3 lines for the deal. Has anyone else had this problem, and was there a solution for it?