There seem to be three issues here;
Are you a proprietary director of "your company" (i.e. do you own 15% of the company)? If so, you are not entitled to the PAYE tax credit.
Do you control "your company" (e.g. do you own 100% of the company)? If so, you should more than likely pay PRSI at Class S.
Is this company that's taken you on as an employee a separate company with no connection to you? If so, you should be entitled to the PAYE tax credit and pay PRSI in relation to that employment at Class A.