Beep card issue - Consumer Complaint for MINISTOP Philippines

I supposed to buy a sachet of coffee and Pizza Kariman at Ministop at California gatden square in Mandaluyong using beep card. I have no problems in checking the balance. It happened at 8.30pm today.the store man says that there was no signal. So I decided not to buy since I don't have cash. And the ambience as well so awful and smells like body odor! The question is why ministop cgs offer beep card to pay in the first place. Completely disappointed!!! Please address this asap.