Can anyone recommend good companies to root cause  and implement solution to fix this issue?

We've done around 60 deals using the fix-and-flip strategy, BRRRR strategy, and build-to-sell strategy!

I'm a big fan of value-add opportunities, whether it's buying something currently undervalued & fixing it up to my standards, or buying something that has additional income opportunities that have yet to be incorporated. 

Now purchasing a home with cash is always good b/c obviously cash is king but also I think the part you might've missed is that, the money your utilizing on these home's won't actually be yours, but the banks or whatever institution you used to fix the home or make its value worth more.

For fix-and-flip pros, BRRRR enthusiasts, and wholesalers alike, the landscape looks different than it did just a couple of years ago.For flippers: What’s your approach to finding end buyers in this market?

And this is why you fix your DTI issue, so you can do things properly and not get "creative" and learn the hard way.  

So, to try to go a legal route because they might have fixed something a little over the limit isn't going to work.You will have to face that you selected someone that was not the right fit and be more hands on. 

But, I like to make relationships with software that take feedback and execute to fix quickly. 

She denies and keeps texting me every day to "fix the furnace".

If you already have a high interest rate, consider a cash-out refinance with a fixed rate rather than a HELOC.