Dollar General

I was fired from having to many overs on my cash balance yet I truly do not believe that I made those mistakes and they were all based on my register which is known for making errors in money and crashing and just not working sometimes and I feel for getting someone fired off of malfunctions of that shouldn't be allowed so I would want someone to go thru the cams or something else like that to prove that I didn't make those errors or that the registers do make those mistakes