Does not work!? Dont waste your time!

Ive gotten up to 4 stamps and then when Im one away from my free coffee...BAM they are gone and Im starting over. I should have had four by now!? Ridiculous and no one at the store knows why it wont work... today had $3 off $15 or more
And THAT didnt work either
Done with this app!!!!

Lovin4myBrain about McDonald's, v5.5.1