Mobile Time To Switch?

I recently switched from Verizon Wireless to Xfinity Mobile.  The Xfinity salesman said that I would be reimbursed $200 for each devise that I brought with me.  This was what ultimately convinced me to switch as I had a balance with Verizon for the cost of two devices.  The salesman said nothing about a 30 day expiration for this offer.  Verizon was also extremely unhelpful and locked me out of my account after I switched, meaning I did not have access to my billing information.  I finally was able to obtain a copy of my final Verizon bill and submitted it for the $400 devise reimbursement/gift card.  Xfinity denied my claim and citing the fact that the Verizon bill was over 30 days old.  I guess I might have to switch again to a company that doesn't offer false promises.