Poor service and abuse of power by Dischem Strubensvalue

I bought a few items two months ago at Dischem Strubensvalue. I paid and immediately the till switched off before it produced my slip. The money went out of my bank and I showed the teller and her Manager Daren. They both insisted that I pay again even though they saw the money went out of my bank. They said if it’s paid twice they will return my money immediately. I have been calling Daren with a plea to pay me back my money in vain. The most depressing thing is that I have driven to the shop three times in these difficult times of high diesel prices, just not to be given my money back. I’m very hurt and dissappointed, I think I must now involve lawyers so they can pay for the stress caused and financial losses on calls and diesel. It’s been two months or more now.