Once the SOL is over, no legal action is enforceable to collect the debt. However, CAs can still try to collect the debt. They can also file suit against you, but the case will go in your favor if SOL is over. Hope that makes sense.
BTW, CA cannot change the date of last activity, it is illegal. If your account is closed to SOL, you might negotiate with them and settle the account with a lower amount. Paid collection is a derogatory mark; however it is better than unpaid collection.