Tim Hortons

I went into a location in Toronto Ontario, Greenwood and Danforth to order a double double at around 5am for breakfast, I had given the cashier a toonie for my cost of $1.85. The cashier gave me back 10 cents leaving me 5 cents short and said "sorry don't have any nickels". How is this acceptable to short change a customer? It is not my fault! She should have given me 2 dimes back! I won't be coming back to tim hortons after getting ripped off. Unethical business practice.