Dollarama

Hello,
On March 27, I bought a few items from the Dollarama store at Dundas and Hurontario in Mississauga. I spent $78.07 on items from the store $25.00 of which was a gift card. I bought the gift card for my mother -in-law birthday as she is a recovering cancer patient and we wanted to lift her spirits on her bday. She has not been out of her house until today and she wanted to use her gift card. At the same store i bought the card she went there and tried to use the card. The cashier told her that there was only .25 cents on the card and called her manager. The manager then came and without trying for herself made some really serious and unprofessional accusations that either my mother in law already used the card or i used it before giving it to her. She refused to give her name or the store number or address so that we could file our complaint and continued to degrade my mother in law and basically calling her a liar.
I was hurt and so disgusted by this lady and her comments behaviour, that we left the items we were going to purchase and walked out the store. I came home and looked at by bank transaction to discover the date and the amount that was spent at the store.
I honestly cannot believe that instead of looking into the matter and trying to come up with a solution this lady automatically started to call us liars.
I spent my money to get her a gift card for $25.00 if i had purchase a higher dollar value gift card it would have been the same thing.
I don't appreciate this and would like to be reimburse my funds or give me back a gift card with the same value. I can easily say the person who sold me the gift card, put the .25 cents on my card and then later got the $25 gift card for herself or someone else. However, i'm not going to accuse anyone of such devious behaviour.
The gift card that was given to me at purchase is [protected]-312. I don't know if that can be of assistance, but I would like my funds back and for that person at that store to be trained on customer service skills.