I've filed bankrupcy and a payday company is refusing to provide their mailing address they stated that they are not required

Check with the secretary of state to locate their statutory agent.

Chapter 13

I think that is very unlikely. I have never seen that happen.

What is the SOL on unsecured debt (credit cards & medical) & once the SOL has passed/expired, how do you get it removed from you

Removing it from your credit will be difficult since it is your debt. In time it will naturally fall off your credit report in about 3 years unless...

I just received a bill for medical equipment 2 1/2 years after the date of service. Is there a time limit for billing?

Probably the same time limit to collect on a contract which is usually more than 2.5 yrs.

I purchased plane tickets worth $26,900 from a travel agency and the travel agency did not deliver the tickets.

File a summons and complaint. Sounds like you got slammed.

Efect of debt that's past statute of limitations (time-barred from lawsuit) on Maryland bankruptcy?

Include every possible debt you can imagine on the paperwork.

HOW DO I FILE AN ASSIGNMENT ORDER AGAINST JUDGMENT DEBTORS? WHAT OTHER ATTACHMENTS, PERSONAL LIEN, ETC. CAN I FILE?

If they are low income then they are probably judgement proof.

Being sued personally for an S Corporation biz card, biz no longer in business. What are my next steps?

We can't teach you how to practice law on this site.

We have performed security work for a company that now is behind paying us in the amount of $40.000 what are our options

Time to hire a debt collections attorney when were talking about 40k.

Has the judgement been renewed properly? It has probably expired.