Boost Mobile Instore Offer not honored

I got a text message today from Boost Mobile that reads as follows: "BOOSTFreeMSG: Stop by your local Boost store and get the Samsung Galaxy S24 for $240! (link to store locator) . Rest. Apply. Reply STOP to END." I went into a local "BOOST MOBILE PLATINUM RETAILER" They told me no. I could only buy that phone at full price. My account also showed nothing for this offer. I showed them the text and they did not care. Boost support said this text is real and came from the sales/promo department. He said there is no way to contact this department. My only option is to be transferred to a department that oversees local stores and have them convince the clerk to honor the discount.

UPDATE: Thank you everyone for the suggestions. A different boost store was able to find the promotion on my account. I was able to get the phone for $347 all in. They make you pay taxes on the full retail price of the phone ($799) plus a $35 activation fee.