Voda BP Vouchers

Between my mum and I we have purchased numerous R100 BP vouchers from the Voda store. I recently went to KZN and I had issues with the following BP stations

1 The Windmill BP According to the petrol attendant they were informed by their manager NOT to accept these vouchers.

2 BP Eshowe Apparently their systems are not set up for this.

3 BP Duduza Service Station Now here they take the vouchers but their pumps only fill R96.34 and not R100 as per each voucher purchased. At this station I used vouchers but did not receive the amount that was purchased...

Please can I get a clarification as to which BP in KZN North Coast accept these vouchers for the amount of R100 as I do have more vouchers that I have not used. I will be going to KZN again and will be going to BPs

I have used vouchers in Lenasia and the amount purchased is what is filled... So what is the difference between these BPs???