You can cancel a HELOC for any reason within three business days after your closing (though you will have to do it in writing), and the lender must refund any fees you’ve already paid. This three-day time period includes Saturdays, but not Sundays. If you can prove that the lender didn’t provide all of the required material about the HELOC, you could get up to three years to cancel the credit line.
If neither of these solutions apply, your best bet may be to refinance your HELOC by getting another loan. Look at your contract to see if there are any penalties for early payoff. You could pay it off with your savings, another loan or even another, better HELOC.