Nationwide Recovery Systems TRS Limited Nationwide Recovery scamming me for money not owed Tyler Texas

I have received two calls from Nationwide Recovery Sytems statin I owd $139.97 to TRS Limited.  Stated for "free" sample but as I did not cnacel within 10 days I owe the amount stated

When the charge showed on my credid card, I disputed this as fraudulent and my money was refunded on my card.  I though this would be end of it. 

I have never received a direct bill or explantion of charges from TRS Limited,  but was sent to collection agency and was threatened with destroying my excellent credit rating if I do not pay. 

Odd thing is, first caller said I could "take care of issue" if I paid them $59.99.   Second caller offered same deal but pay $69.99.  I requested a bill for services be sent to me.  First caller said would take 8-10 weeks to be sent.  then he said coud email to me,  which I have never received.  

Second caller advised me to look for address for TRS Limited on Google as they did not have the debtor information .  Only have name and amount owed.   I tried to google TRS Limited, and all I found was multiple Ripoff sites recounting same issues as mine

No WEB or physical address found for TRS Limited.    

Karen