I've heard from friends that MH on occasions didn't manage to relay schedule changes to passengers. IME, they usually send an e-mail and a text to notify you of schedule change.
Having that said, it is amazing that MH called you and asked if you are going to make your flight. I find that MH agents (usually in KUL and around Malaysia) are very flexible if you missed your flights, are late etc. It's just tough luck when you are in a station not manned by MH staff as they usually go by the book.