A few years ago the CRA messed up a tax return of mine and credited my payments to the next year. I got a letter from them saying your tax bill of $11k has not been paid, please pay it, and here are some interest payments due, also you have $11k in credit for next year.

So I called them up, waited on hold for 5 minutes. I spoke with a CRA rep who said "Yup, we screwed up. Fixed". And it was fixed. Total time to fix an $11K screw up? 15 minutes. Try that with any other organization.