I was offered a 25% discount on my $129.99 monthly service plan if I upgraded my phone and took advantage of a two for one offer. Bottom line question is are Sprint franchise people in the mall's authorized to discount existing service plans, or is this a scam and customer suport nightmare waiting to happen?
Most likely the kiosks are adding a corporate employee discount to the account. This is supposed to require proof you work for the company, and if you do not is definitely against several Sprint policies. Every discount addition is monitored and if anything fishy shows up Corporate Security investigates. This can result in the discount being removed because it is not valid and termination of the employee.
If anything seems too good to be true about a discount, plan, etc. then it probably is.