Worst service received

Good day. On the 31st of January 2022 I went to the boxer store in the Chris Hani mall at ab 6pm where I spent about 2 hours in the shop. The service from the cashier was OK however I got to the door where the roller shutter door was already closed. I ask one of the security guards (a lady by the name of Maria, this is the name she gave me as she had no name tag) to kindly please open the shutter door as t could not pick or pull out the trolley as it was full. I also mentioned to her I have a back or spinal cord problem as a result I couldn't push out the trolley as the door they were using or had opened for us to use was high up therefore I was instructed to carry the trolley full of groceries. Maria then told me I had to carry that trolley because no one forced me to buy that grocery . She said every customer has to carry their trollies on their own. The worst thing was the way she said it with so much rudeness, disrespect and anger towards me. I honestly think I deserve some respect just as much as we respect them. I was really disappointed considering the age of the person who was rude to me.