Okay I'm trying to buy a bus ticket home (my parents drove me here, but I need to get home before they're available to drive me back).

I called customer service and said "I have a knee scooter that needs to stay with me". And they said "oh do you have a wheel chair?" and I said "no, a knee scooter". And online they have "mobility device", but I'm getting the STRONG impression that they mean "wheelchair" by that.

But I don't have a wheelchair.

I do not know how to negotiate this and I'm terrified.