Taken from pillar to post

I bought data bundles at an MTN store on Monday the 29th of February 2016 at 14:22 so that I could load onto my modem when I get home later after work only to find that when I load it says invalid pin. I tried that for several times till I got barred from retrying to load for 24 hours. I pursued the same procedure to load on the 1st of March 2016 but it kept on saying invalid pin, so on Wednesday March the 2nd I took the voucher to the MTN store where I bought so that I could get help loading it because it says invalid pin but I was told that the same voucher was loaded on another number which definitely is not mine and that there is no way the could help me so I should call customer services which also didn't help because they kept on reciting the same thing, and they insinuate there is no way a duplicate could have been printed so its my fault I gave the recharge voucher to somebody else so that I could later on make claims that the voucher is invalid.