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When you say PRA are you referring to Portfolio Recovery Assets? Does you credit report indicate that Capital 1 sold the account? If not you could call Capital One to confirm and should be able to tell who they sold it to. If Capital One still owns the debt offer payment in full if the account is recalled from the collection agency. If the account has been sold then then deal with whoever owns the debt now.
If portfolio is going to sue, they will send you an intent to sue letter before filing. Once they serve you, you'll have 20-30 days to respond depending on your local laws. Always respond as not doing so creates an automatic win for them. Those 20-30 days are your last chance to work something out before going to court. If you teach a settlement agreement, the case will be withdrawn. Also, don't hide from the summons. They'll try to serve you a few times, but if they can't dins you, they'll ask the judge permission to print in a local paper. At that point, you won't know unless you see it meaning you have a much higher chance of defaulting.