I see three options here.
1. Stop contributing to RRSP (Boo! I wouldn't do this)
2. Continue to claim it, and if you are directed to remove it, write a letter to request ra waiver of the penalty, and you might have to remove a portion of the RRSP at that later end of year tax time.... by the time it happens, however, it will be a very short time until you have room available again. I did this, and by the time I wrote for the waiver, it was the next RRSP year (January / Feb) and i had room again.
3. Keep the employer match, but withdraw other RRSP funds that year. this way you keep the match, but you end up paying taxes on your other withdrawals.
hmmm ... you might have another option... from CRA
"Generally, you have to pay a tax of 1 % per month on excess contributions that exceed your RRSP/PRPP deduction limit by more than $2,000 unless you:
withdrew the excess amounts, or
contributed to a qualifying group plan"
Because the employer match is to a group plan, perhaps you are NOT penalized on the overage... i don't know if your plan is a "qualifying group plan", but maybe you can find out.