Help! Should I cancel my HELOC?

[Steven Wachtel]

I signed all the closing paperwork for my HELOC on Monday, July 11, so today is the last day of my three business days to cancel. I was reviewing the documents again this morning and noticed that the interest rate in the closing package is 0.75 percentage points higher than what was on my Lock-In Agreement from June 10. Bad on me for not catching it during the closing - it was at my house with a mobile notary and the whole thing was very rushed. Lesson learned. I plan to call today as soon as the bank opens to see if they can explain what happened.

What would you do?  This is on a $100k line.  The lock-in rate was 6.7% (I realize that's still not great) vs 7.45% in the closing paperwork.  Are there any other ramifications (other than a lot of wasted time and potentially losing the appraisal fee, title search fee, etc.) that I should be thinking about?  I did pay the closing costs up front, which I now regret also.  I realize that in the big picture, the difference in rates isn't going to make a huge difference, but it has me questioning the lender.  Maybe I'm just misunderstanding how the Lock-In Agreement works, but it seems pretty straight-forward (Florida Statute, Chapter 494, Section 0069, for reference).

I really appreciate any input.  

[Mark Fein]

There was a .75% increase to the Prime rate around June 15th. HELOC rates are usually tied to prime.