Excess withdrawal from Rollover IRA due to employer contribution

Hi,
I recently rolled over my 401k to IRA. After the rollover, I received a mail from my employer stating they over contributed to my 401k plan a couple of years before and they want me to repay that.

Can I do excess contribution withdrawal from my IRA and pay them back? If I file an excess withdrawal would it be treated as distribution and the amount would be added to my gross income while filing taxes?