Vishal Mega Mart Shimla — They think we costomers r fool

I am shashank being costomer from last 7 years of this brand . In new delhi its quite good but in shimla sanjauli branch, , the think we costomers r fool . I had asked u given me diacount on certain product cashier says yes . Actuall not, the think costumer dont check the bill, next day i was back with my bill, but insted helping .they said it was not discounted product the counter was a tagged buuy one get one but the said it was not that products it was a simalar product and it was messed by the customer only and refused to give discount or change the products. . Wwhen i asked to give discount hi said gven. Insted i wud nt had taken the product . EVM not workin .went to atm for cash . Not cooperate next day want any action to be taken till iam not going an not suggests any body