I purchased this lock 2 days ago. followed the instructions and still am unable to set up a code to unlock the door. I press the button on the inside part of the door then enter the code I want to set and before I get to the 2nd number the lock beeps 3 times telling me something is wrong. The materials say to call in the event of a problem but there is only someone available 6:30 am to 4 pm PT