lol well typically a bigger piece of machinery being needed...I would automatically assume that the cost would be higher especially if it's being rented but of course, people speak without actually thinking about the long term. So tehnically since nothing was in writing and if there weren't any witnesses when it happened then no you're not obligated to pay the cost of the extra machinery/labor. Plus, as a company, if they wanted to get paid then obviously it's their obligation to provide you with that costly information before hand. If she was ever given any papers with prices or company information it needs to be re-reviewed to see if it stated anything about a higher price for another rental. If not then like I said...no you're not obligated to pay any extra costs. My best suggestion is to no longer use that company and to seek an attorney. You may want to ask the company for any pamphlets or information on the company that you can use if you do decide to go with an attorney before it gets sent to collections and ruins your credit. You may also want to document any situations you may have with the company word for word if you can just in case it comes to bite you in the butt later on. If you can't afford an attorney, local Colleges can provide students majoring to be lawyers that can help you with that for free. Good luck to the both of you!