Perplexed, I started joking that they should change their name to "Buck & a Quarter". If I was in that position, I would ask for the manager and say hey...I just patronized your store but I cannot carry these packages due to my disability. Would you please send an employee out to help me with that. Any manager worth his or her salt would do it, even if it meant being the one who assisted. Very rarely have I asked for anything in a retail establishment that I didn't get.
A blind friend of mine says when she goes into Walmart, they provide someone to go around with her. We took her last time, so that wasn't necessary. She also got help from a Burlington employee who helped her out of the store in her rolling walker with a seat while her daughter pulled the car up. But unfortunately, the woman allowed her to fall and she wound up going to the hospital.