When I was at Globe Business Center. The CSR wanted to charge me for the replacement of my SIM card. I protested and insisted that it be free because I did not tamper with the defective card.
Also get confirmation on when the SIM card will become active. In my case the CSR said it would be up by 30mins, I put it in at about 45mins and the SIM card was already working.
If you're sim card suddenly stops working have it replaced but insist on waiving the fee. No need to pay if you're not at fault.