Bad service

I went to shoprite at setsing shopping center at Qwaqwa to purchase Telkom mobile airtime so the agent was complained about her till roll not being able to provide an accurate proof of payment which is till slip so she decided to go to the back office to which i told her no problem, so she came back with a copy of the receipt on an A4 page asking me to insert the voucher which i tried a couple of times and i couldn't go through because the voucher was invalid. So i ended up leaving because the manager told me that there is nothing that he can do and they have had the very same issue before and that it's beyond him all i need to do is to call telkom mobile customer care, when i arrived at home i called telcom customer and they couldn't assist me because the receipt i received from shoprite did not have serial number... i have never had such bad service at shoprite before and my only problem is how the manager did not even try to find a solution to resolve the matter instead of trying to blame telkom. I desperately need my airtime because i have no means of connecting to the internet.