It appears that a collection agent now owns your debt account. It is likely that the collection agent bought your debt account for 5%-50% of the original balance. The add-ons and fees are an invention of the collection agent, and used as leverage by the collection as a negative reinforcement to prod you to settle sooner rather than later.
Contact the collection agency handling the account to discuss a settlement. Do not reveal to them you are closing on a house soon or they will use that information as leverage in the negotiations. You may wish to offer 20% of the balance to begin, observe the creditor’s reaction, and then increase your offer as you feel appropriate.
I would expect that a creditor with old debt will likely settle for 40% to 50% of the balance owed. See Debt Negotiation and Settlement Advice for tips and tactics when negotiating a debt settlement.
If a creditor accepts a reduced balance settlement, it will usually expect the settlement to be paid within a matter of days, so you should make sure that you have the necessary funds available to tender payment before you begin negotiations in earnest. Get the final settlement agreement in writing, and keep copies of the settlement in several safe locations.
Settling a debt should cause the account to report a $0 balance to the credit bureaus. For more information about negotiating with your creditors, you can read this debt settlement article in Bills.com.
I wish you the best of luck. I hope that the information I have provided helps you Find. Learn. Save.