Trying for a while to get my voucher fixed

I have been at a few stores trying to get my voucher fixed and yet I still have had no luck, they also stating that I have swiped my voucher at The Glen, witch is hell and gone from my house. I have tried talking to a manager and they just keep you on the line till it dies. I have emailed and was told straight go to the store to sort it out. What a bunch of useless employees at the call center, they are far from helpful, they are in fact just making the problem worse. Please be careful of using a voucher online, since that they not willing to sort out a problem if it has happening on their side.