Restore for the backup you did before the last import. 

Unfortunately deleting data is very tedious. Sometimes it is best to start from scratch if you didn't do the backup. (NOTE: Learn from your misteaks! and know that I have been where you are.)

OUCH!!!

Thank you for your response.

@bernie10 I do have one other thing to try - let me know if it works.

Do a new import and elect to have it overwrite the old import.