If you stop paying into your pension, you might not get your contributions refunded, you might not be allowed to resume payments and your eventual retirement income will be reduced.
So, unless you're leaving the company and are not allowed to pay into the plan once you've left, you could consider reducing your contributions rather than stopping them altogether.
If you have been paying into PensionSaver and then leave the company, you can continue paying into it once you've left, even though the company's contributions would stop. This way, your pension can move around with you.