I'm paying a loan off 3 years early can I claim any money back off the interest that I have paid please help

Yes and no. What you should be doing is requesting a payoff balance from the lender. That balance will not include any future interest due. However, such balances are often estimates because of timing. When the payment is received, the actual principal balance is calculated and you should have any overpayment refunded. But you can't get a refund on regular interest already accrued.