Darkcaster,
The issue was that you were asking for help and a very kind player made a real effort to help you. She offered you her own sponges, and then also told you where you could buy them. Replying with "That's a lie" is both rude and hurtful.
I am sure you can understand why this is not a very nice reply.
Then, as your attitude continued to worsen with "Fine, I'm sorry." Another very kind player located the sponges in the shop to help you. That player was not being sarcastic or trying to make you feel silly for overlooking them, she is a kind person who was very honestly trying to show you where the sponges were.
On this server, being rude to people who are trying to help you will always be frowned upon. A simple "thank you" would have been lovely.
You've been with us a long time. I am going to lift your ban now that you've had some time to cool down. I do hope you'll think carefully about what I have said here and try to choose your words more carefully in the future.
See you on the server.