Settlement Letter / Language

I have a settlement letter from Wells Fargo in hand. We've verbally agreed to a settlement figure but I told them I needed it memorialized in writing, so they did that. However, I want to be certain there isn't anything missing from this letter.

Also note that this settlement is for a HELOC loan which had already been charged off (per Wells Fargo), and is still with Wells (not sold to a third party yet).

Here is an exerpt:

"This letter confirms that Wells Fargo Bank has agreed to accept a settlement of amounts owed on the above-referenced account. The current balance is $xxxx. Wells Fargo has agreed to accept XX% of the curent balance, or $xxx payable by XX/XX/09. The remaining balance of the obligation will be forgiven. Upon full payment of the settlement amount, Wells Fargo Bank will consider the obligation settled and will report to the credit bureau agaencies we report to as such."

It goes on, but this is the pertinent information. I just want to be certain that I am covered from further collection action, having the "forgiven" balance sold to a third party, or litigation.

Also, because this is a HELOC, should I ask for explicit language stating they will release the lien against the property. Not that this matters much since it will likely foreclose... but still.

One other thing is that the account number referenced on the settlement letter contains three "new" digits in front of my account number. Should I be concerned about that? The rest matches my account number.

Thanks for the input.