BP's own @Mindy Jensen is one of our local experts on that real estate strategy.And oh, yeah, that's the best piece of free advice I can give you.

 Make something....something on the end of broom handle, piece of pvc pipe, electrical grounding rod, etc.

I agree Jay that it is rather a lengthy piece of information but the premise is of course "predator lending" this is just feedback to allow other's to exercise and prepare for unethical business practices specifically to doing one's financial due diligence such that this is an illustration of caveat emptor or let the buyer beware to prevent fraud from manifesting as a reality with no recourse for action. 

The 1 piece of advice that nobody seems to get, or if they get it they ignore it, is to "stay in your lane."  

If I am unable the get the replacement pieces I need is it reasonable to hold the entire deposit?

At best they can tell you what their buying rules and goals are but that may not have anything to do with your goals.Take the time and figure this out first before you buy your first piece of property or you may end up like I did and buy 35 of the wrong homes and lose a lot of money getting out of many of them all because I did not have a plan or criteria prior to buying, the odds of me succeeding were extremely low in not impossible.

Typically a mixture of mail pieces brings the best response.I would suggest sending a different mail piece every 3-5 weeks.

Every piece of material is carefully calculated and has a predetermined destination.

I mean I bought lots last year in Atlanta for 4k a piece and they were .5 acre nice lots..

A big piece is certainly good tenants.Good luck!