MTN Westgate Mall Shop Voucher

On the 11th of October my husband purchased a Huawei Nova 12i at mtn Westgate Mall Mitchells Plain. This was a contract phone and with the deal you would get a accessory voucher of R300 and a Pick n Pay R500 voucher. When he received the phone he only received the accessory voucher and was told to do the Pick n Pay voucher online. Today is the 25th of October and he now gets told that only the first 500 customers got the voucher. Keeping in mind that the deal just came out in this month so tell me how could the limit of 500 already be reached? Sounds like staff be taking these vouchers for them then. No proper service was given or any follow up which is very unprofessional. Could somebody maybe assist me with this please?