come back tomorrow

Going to a shop that myself and my mother spend thousands of rands in I excpeted a bit more help, so my mum bought a pants of R350 on her account she lost the receipt we tried to take it back, I mean its on ur account we can tell them the exact date, the manager tells us come back tomrrow its to much paper work , REALLY you have a computer... She had a stinking attitude so our thousands we spend is nothing we treat us like dogs I will never shop there again. Can't help me this one time I ask for help