Question for the OT legal team. Re: car trade-in payoff

In LA, what is considered a "reasonable amount of time" for a dealership to pay off a loan on a trade-in?

We recently bought a vehicle and traded in our old one like we've done several times before and have never had a problem of having our old loan being paid off by the dealer. This time however, we are having way too much trouble getting our trade-in paid off. The dealer said they were doing a 20 day payoff which I was ok with at the time. But come to find out, the bank only gives a 10 day payoff quote and they do a per diem for the remaining time. We are now approaching 30 days with another payment coming due and the old loan is still there.

I wouldn't have such a bug up my arse about it but the finance manager that I've been working with has given me 4 different answers, talked in circles, and has straight up lied to me about when I can expect to have it paid off. A friend of mine with some legal knowledge said that we are basically talking about theft here since they took possession of something of mine and have not compensated me for it. I'm not to the point yet of going so far as to threaten theft but I'm trying to see how long a reasonable time would be before I really start to drop the hammer. My friend couldn't answer that but said to look in the contract we signed and if there was any kind of date or time frame specified but there isn't.