Hello. Has it been confirmed if the slab is on civil property or not? If so, you'd need to reach out to your city. You can always check your property lines and locations based off of civil records here: https://maps.calgary.ca/myproperty/
If it is on your private property, let me know and we can discuss having this escalated!
Alright. Our team always confirms with the city itself before any work like that is put in place to ensure it's not on private property in any way, but we can definitely escalate this to have our team look into it and reach out to you personally. I'll send you a private message to discuss, thanks.