Your excess handling is set to "Separate billing after exceeding" which will not stop service immediately after exceeding.
This is what happened:
1. on 9.28, limitation reached, and a notification mail was sent to your email address.
2. on 10.1, the bill was generated, and a notification mail was sent to your email address.
3. on 10.10, the service was stopped because no payment happened.
4. on 10.12, a new payment was in, and the service recovered.
We have confirmed that on both 9.28 and 10.1, mails were sent successfully, and service was not stopped.
Please contact us if anything unclear.