Excessive Credit Check from Comcast
In general, it is unusual for a credit check to occur when you are terminating a contract, since you are no longer requesting credit. If the credit check was a "hard pull" it will stay on your credit report for 2 years, but will only have an impact on your credit score for up to 12 months. If the check is a "soft pull" it has no impact on your credit score. Since you're past the 12 months boundary anyway, I wouldn't worry about it.  That being said, please feel free to continue your investigation and report back if you can get Comcast to admit they performed the 2nd credit check. I'm sure we'd all be interested to hear their explanation for it.