If you would rather send something electronically that is also an option.
https://actionnetwork.org/letters/ct-riders-deserve-safe-transit/

You can copy and paste this message if you want to, or write your own:

"I am writing to express my disapproval of Calgary Transit's management to contract out cleaning services to Bee Clean.

Keeping public transit running during a public health emergency has taken a a great team effort by thousands of dedicated long-term employees.

COVID-19 is still a health threat. The system remains extremely vulnerable. Contracting out the fueling and disinfecting of these vehicles during a deadly pandemic is a reckless and irresponsible experiment that puts the riding public at risk.

I ask that you please reconsider your decision"

It's very easy to think that a single person's message isn't going to make an impact. But when a group of us gets together and we have a unified voice that DOES make a difference and do get noticed.