Promised Vouchers 3 months late....and expired!

Vodacom....I'm now besides myself I'm so angry. I got 2 upgrades with Vodacom in December after being a loyal customer for years. I was promised R2800 of vouchers with the upgrade and after fighting for 3 MONTHS for these vouchers, Expectmorepromos FINALLY sent me the vouchers, however 4 of them are all expired and can no longer be used. This is POOR and false advertising and from the customer's side not fair that I've had to fight for 6 months for something that was promised to me with my upgrade that I'm paying over R900 a month for. Can someone PLEASE receive this with the most URGENT attention.....