BP voucher not working ****

I bought a BP voucher on the VodaPay app. I purchased other BP vouchers on the app which worked, this one did not. I emailed customer care twice and no response was given. In the interim, I attempted and had hoped that it would work in three separate occasions and to no success - they declined each time. The manager of the branch I was at, informed me to complain as this usually doesn’t happen with these vouchers. This is quite upsetting as my money cannot be wasted like this. The voucher I purchased was valued at R440, which I purchased for R400. Purchased on Wednesday 5 June 2024.