contact Lyft, open a complaint

they will tar and feather this driver

Contact Lyft since he is holding onto your property, and have them push him to return it. Text him that he needs to return it asap since it isn't his and it's your assistive device.

Lyft will charge you $15 returned item fee. Hopefully the driver returns it to you.

https://help.lyft.com/hc/en-us/articles/115012922987-Lost-found-for-passengers#returnfee

Fellow blind person here. I would follow the advice of the above posters about contacting Lyft, but I would also order a backup cane when you are able. I have a lightweight cane that I always use, but I have needed my backup a few times when I’ve accidentally left my main at home or in the car.
Also, I would stress to whomever you contact that it is your assistive device for your disability. Good luck.

You only have one cane?! I have one in my hand, one in my bag, and I have been accused of being a specialist at distributing them all over the northern hemisphere when traveling.

In all seriousness, my collection is in various states of repair and involves old ones, new ones, metal ones, carbon ones, ones where the elastic has gone all saggy and so on. Not all of them are great but the idea of not having a spare brings me out in a cold sweat.

You should always have a backup cane in case your primary one gets lost/damaged. I prefer my NFB rigid cane, but keep an Ambutech slimline in my bag as a backup (because it folds up so tiny).

But yes, also contact Lyft and tell them what's going on.

Hello! I advice you to contact the company/organization and request returning the property, because it's yours. Especially if it's several days you're contacting the driver and he isn't willing to return it to you, you're mostly eligible to get it back. Usually, company might tell you, that since it's your property and you really need it, and especially if it was an assistive device, you should be making sure to cary it everywhere. In that case, if you've contacted driver as soon as possible and reported hat your cane is there and you require it, and you also have the call log stating that, you can make a request to them returning your cane stating that you accidentally left it there. Please also check if the company requests any additional money to pay for this, since it's subject to your jurisdiction and the individual contract.

HTH.