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A CA cannot be an OC. What probably happened is the real OC sold the debt to a CA, then the CA assigned it to another CA to collect and made themselves the OC. They are still a CA and have to abide by the FDCPA.
I would send them a DV letter. It will put in place the cease collection bar until they validate the debt. Which means, no phone calls, no letters, no updating your CR. If they do they will be in violation of the FDCPA.
Without sending the DV you really will have no idea who it is from. It would probably not be the distant education class, it is too old to report. But, again anything is possible with a JDB.
True, do not dispute with the CRAs while applying for a mortgage. They would want them removed. Disputing accurate information is a no no any way.
It depends on your LO. Some require all collections to be paid, others collections that occured less than 2 years ago. It is hard to say.
Getting the collection off would be best. Send the DV, if they validate, send a PFD.
How old is the debt? you can try for a settlement.
Open is the date they aquired the account from the OC. Do you kow the DoFD with the OC?
Send them a DV
"You are reporting I owe this debt, account #______. Please validate under FDCPA 809."