Edit post resolution: I was not expecting such a s...

Edit post resolution: I was not expecting such a swift response or resolution. We went back in today, after I relayed my story over the weekend as was requested, and we were treated professionally and sincerely. I am so very appreciative of the way this was handled. I never once had to raise my voice, or throw a tantrum. I just told my story (which based on your comment you had already looked into prior to contacting me) and immediately a resolution was sought. Thank you very very much.
Original 1star: The service my mom & I got today was the most unhelpful and disrespectful we've ever encountered. Dollarama was more willing to help than the people in this store today. The lady who helped us did the bare minimum she could. If she didn't want to help she should have sent someone else over and stayed behind the till. That was disappointing, but what was truly disrespectful was the skeezy sales-type guy who started barking at us as we left disappointed. I'm guessing from the way he barked at the staff he was a manager of some kind (he never introduced himself). During the entire conversation, he never once addressed my mom. He preferred to speak to me, despite the fact that my mom (in a wheelchair) was the only one talking. He failed to listen to a single word we were saying.
I guess she's just too young (ie not a senior), or too disabled (has to remain in a wheelchair) for the bare basics of customer service and respect.