Last month, it was the first time my website reached to its bandwidth limit. Then, I quickly asked Sam from ServerFreak Hosting for help. Only he can help me because my hosting is sponsored by ServerFreak so only he can increase my bandwidth quota. Thanks to him, he had increased my hosting bandwidth to 60GB. So my website runs back to normal.
But today, early in the morning, when I press Enter after typing my website URL, BUMP!, I got the same error message directly to my face.