Why monthly payment deduction at S$30 instead of S$21 for march 2020?

Hi there, vma. 

It seems like we're looking into our QuickBooks billing and subscription fee. If we've directly signed up, the discount is only up to 6 months. After a month, it charges back to the regular fee. This goes the same way if we subscribed first through the free 30-day trial, after we subscribe it uses the regular rate. 

I also suggest reaching out to us so we can check your statements and the charges. Here's how: 

1. Go to the Gear icon, click Contact us. 
2. Enter your concern the box something like Subscription fee. 
3. Click Let's talk and then choose to either start a chat or email. 

Let me know if you need anything else. Thanks!