Odds are the CSR's KPIs are Average Call Time and Resolution on First Contact, so as long as you give them plausible deniabilty by claiming motherboard change, it allows them to quickly resolve and close the call vs forcing you to have to call back with documentation. Besides forcing you to buy a retail license likely didn't add a nickel to their paycheck, so why start a fight with the customer that will only make the call longer and possibly require escalation.