horrible service

I was told that I have points worth R100 at jet mart , so I went to jet to get some things but I was told there was an error with the cellphone I registered with .after 20 minutes I decided to use my card , the debit went out but the lady said there was a declined, I showed her that my account was debited , after 30 minuted in that store I was told I can't leave the store because they have to call the operations. I decide to leave without the goods , my money still not returned in my account . I tried calling jet complains help desk but I was not assisted still . I am disappointed because still this day I was not helped ( thuis happened on the 4th of this month ) but am still in the dark