How to check when reaching 90 days expiry? Or do we need to remember ourselves?

Finally done with webe unlimited. Terminated my line today. I was planning to suspend only today as I already have unifi and not using webe much. Their line also been slower these days after free unifi mobile sims giving away. Was thinking to let it cool down a month and see if it gets better later. Told CS I am going overseas for 1 month and they requested to see my flight ticket. Found it outright ridiculous. They don't have the right to do so and it's my privacy. So decided to terminate it and enough with their bullshit. Now i'm really #Bebas from their shits