T-Mobile Rebate Rip-Off

Help,

T-Mobile has refuse to honor their $30 cell phone rebate. All information was submitted for a $30 rebate (Samsung celluar phone) They said my wireless number did not exist in their system. The last two numbers were in reverse order. The notification letter was dated 05/03/07 with a 04/13/07 deadline to respond. How can I get my rebate?

Thanks