PC Support Office Asking for a payment for services not rendered North Bergen New Jersey

I am 92 year old male.  I have a Dell Laptop that I do my banking and contact with family.  I had a problem with my computer and I updated my McAfee account and thenwas switched to this support team that claimed they were associated with McAfee.  I was on the phone and computer for over 6 hours and was having difficulty understanding the technician.  He had an accent and kept having repeat  things regarding my computer. I gave him control  and things went from bad to worse. My screen went blue and I finally told him it was not working.  So he said there would be a $100.00 charge.  I paid with my debit card.  The payment showed on my bank statement then immediately wasnot on the statement.  I called for a refund to find out they had not processed the debit card.  Now they are saying I owe them $249.99.   I had to have my computer  fixed by another company.