overpayment of benefits

i was receiving PA EUC benefits and started a part time job for 2 days and they didnt give me work after that. I recently received a notice of determination of overpayment of benefits from PA labpr and indusrty that my employer who i woked 2 days for said that i voluntarily quit work because the job was not right for me what cn i do to fight this and win so i dont owe back over $2,000? - Is this your question? Add additional information