Hey if you want I can go over your finances for you. I help people manage them for a living and have a portfolio of customers I work with. But that's up to you, I wouldn't blame you for not sharing that information with a random person on the internet.
My first suggestion is to talk to the finance office. There's obviously a big problem if they're going to tow your vehicle for not answering calls and you need to find out what it is. There could be a big issue with credit or the terms of your contract, you never know, hence the calls. Depending on your state though you should legally have received notice that they were going to reposess your vehicle. You may luck out and be able to work out a payment arrangement.
Second start prioritizing your bills. If it's not absolutely necessary, don't pay it and I'm talking cable, internet, credit cards, etc. When it comes to crunch time when you just don't have enough money, yeah your credit is going to take a hit but make sure that your SECURED debt is being paid on. Credit cards won't come and take your house.
Third, I'm going to guess you don't have any assetts such as 401K, etc. Garage sales are a good way to make some quick cash. Have spare time? Hit up a Labor Ready or if they're still around answer some baby sitting ads to make a quick buck. Don't pull out any loans though.
Lastly, you really need to take a good hard look at your financial situation and see what you can do to balance out your budget and that takes some thought and care. Depending on debt, you may be able to re-structure it just be aware that if you do, it's going to hurt your credit and they're bound to ask for proof of income including paystubs, taxes including W2s for up to two years, bank statements, etc.