If you cancel, you will of course immediately receive the current equivalent value of the fund units purchased with the money you paid in yourself. Your fund units will be sold and the equivalent value paid out to your reference account within 10 days.
The stock markets fluctuate and with them the value of your fund units. At the moment, stock market prices have fallen sharply because of the war in Ukraine. If you sell now, you may make a loss.
If you cancel now, i.e. before the start of your pension, you will lose your entitlement to the cashback and the safety buffer you have collected so far.