Please HELP! MIDLAND CREDIT MANAGEMENT. Need help to clear out doubts!

Good morning to all,

Yesterday I pulled my credit report and saw this (MCM) entry for. I really have no idea what this is for and have been reading topics on MCM on this forum.

I concluded I should send them a Debt Validation letter asking them to prove they legally own this debt and what is that I owe.

The entry seems to have appeared on my CR this month and will not state much more than the following :

Type of Account : Open
Date Opened: 10/2008
Date Reported: 08/2009
Date Major Delinquency First Reported: 01/2009
Date of First Delinquency: 10/2005
High Credit: 800$
Credit Limit: $0
Balance: 800$
Amount Past Due: 800$
Actual Payment Amount: $0
Date of Last Activity: N/A
Months Reviewed: 7
Activity Description: N/A
Type of Loan: Factoring Company Account (debt buyer)
Comments: Collection account
No 81-Month Payment Data available for display.

1) Is it too late to send them a Debt Validation letter?

2) Why is the "Date Major Delinquency First Reported: 01/2009" and the "Date of First Delinquency: 10/2005"?
I do not quite understand the difference between them.

I have been away from the US for the last 3 years, thus I have not had any credit opened during this time.
Also, I am not certain if MCM has tried to contact me because of me being abroad.

I lived in Texas the whole time I was in the US. I found out the SOL for Texas says:
The Texas Civil Practice & Remedies Code provides a 4-year limitations period for types of debt. The SoL begins after the day the cause of action accrues, (Section 16.004 (a) (3)).

Does this means that after 4 years and if the Date of First Delinquency was on 10/2005, then my SOL should end in a few months? But then they have reported Date Major Delinquency First Reported: 01/2009!

Please I would really appreciate any help and info you can give me. I need it.

Sorry for making it so long.

Thanks in advance
JC