Lawsuit Drafting against Walgreens Needed

Need a lawsuit written against Walgreens, 3920 Hampton Ave, Saint Louis, MO 63109, 314-351-2100, on December 10, 2025. This store would not accept my two coupons that were printed from my printer with the name and symbol of Walgreens and barcode to scan because they only accept physical coupons, as my coupons could have been fake. The salesperson was Carol F. I am a 64-year-old African American lady in a white area who was under great stress to drive 20 blocks to another Walgreens, 7339 Gravois Ave., Saint Louis, MO. 63116 that accepted the coupon for my Christmas card to my family. I was under stress because of driving the 20 blocks with mechanical issues with my car. I had just found out I needed a new battery, tires were bad, the left lower and upper control arm on my wheels were bad, and I needed new front and back brakes on the car. I have no family in Saint Louis and live on a fixed income, and I wanted to send the cards to my family in other states. How much do you think the case is worth. I know how to file for free in court, being low-income. How much will you charge to write on appealing paper?