I followed up with Lenny's Burger Shop and spoke with a manager by the name of Gina. I don't know if she was embarrassed or frustrated with speaking to me about my "wet burger". She asked if I had a receipt, I said I did, and we exchanged names. After she learned that I had a receipt, she seemed a little friendlier, and told me next time I was in the area to stop by and they would remake the sandwich.
Today, I just stopped by to pick up our remake burger, and to order more burgers for the office. We had a huge runaround from the employees who said Gina " didn't tell them anything." And even after showing them my receipt, with Gina's name on it, they told me I could only get my remake during Gina's hours, but then couldn't tell me when Gina would be back.