Hi has anyone used business credit card stacking to go about BRRRR’ing real estate?

THanks.our tax cert came back with 4200 in back taxes and this note too: "There is no Tax sale/lien on this property""Active Judgments and LiensDoc # or Case# orBk/PgPlaintiff's Name Defendant's Name DescriptionDateRecordedAmount($)************ /CAPITAL ONEBANKJANEDOEJUDGMENT AGAINST JANBEDOE(Credit Card Judgment (orConsumer Debt))03/06/2007 1,571.93J*******4 /MIDLANDFUNDING LLCJOHN T.DOEJUDGMENT AGAINST JOHN T.DOE (Civil Judgment)06/11/2009 2,266.03J****** /STATE OF OHIODEPARTMENTOF TAXATIONJOHN T.DOE ANDJANEDOESTATE TAX LIEN AGAINSTJOHN ANDJANE DOE (State TaxLien or Warrant)03/08/2017 3,154.94

And I still receive post cards from these jerks, wanting to buy the property they already whole selled and the one they defaulted on!

HELOC, cash out refi or credit card advance. 

This is due to the fact that in the state of NJ has a law which states that any property with 3 or more units is subject to NJ GREEN CARD INSPECTIONS. 3-FAMILY homes being sold without the Green Card or failed inspections could result in lower sales price.

If I have available 40K that can take from Credit card for 20% down.

They also told everyone to ring their credit card provider at lunch and ask for a credit increase .

Also, I recently did a balance transfer from my high interest credit card to a credit card I already had opened with a zero balance (they offered me 0%balance transfer ) my credit went from 784-700 because of this!!!

My question is, since I just started out I don't really have a lot saved up and I've never had a credit card(I just ordered one to start building my credit), do I just sit here and let this deal go to waste or is there something I can do to get the money?

Should I get business cards so I look more professional?