Spar data ****

I went to Savoy Spar two weeks ago and purchase R39 data I got home to recharge and it said invalid voucher - I went back out to seven eleven and this time it worked - I wrote a letter to Spar head office - explaining what had happened I never heard back from Glenda - then complaint was handed over to somone else after resend same emaiil - I was asked to give details and the name of the spar dispite the fact that the spars name was in the subject box and that I had sent photos of the receipts - I said as much and have heard nothing since then . I believe their is a **** as. The voucher did not credit to me and yet was expired - and spar will not refund vouchers - as they have no proof that the voucher wasn't used and R40 is too little for most people to bother about - I spoke to telkom and they said the voucher had expired and they were going to investigate it. In addition to that I bought two other products from Spar that were clearly marked at a certain price but at the till rang u as more - the amount small changed. Was only ten rand but it was the principle - it took a further ten minutes to correct the error thus wasting my time - isn't it ******* to incorrectly price product