Where's my voucher

Bought a machine with free sleeves voucher... been trying to get my remainder of my voucher since september. Every week when I go to the store, i get the same message. They cannot assist as it needs to be done from headoffice.

This is ridiculous! Keep your promise and give me my full voucher.

I spend more than enough with Nespresso. The voucher is the principal, don't sell something and then let your clients stuggle for 2 month to get something resolved