The letter of guarantee is on the website
Your customer said that he never saw any letter of guarantee so it was his confession not mine, so I can't verify that on status page.
how do you know that the user did not manually deleting the logs ?
He said that he didn't deleted anything manually, so it's his word against yours, and he is complaining.
I also don't even know how and why should manual deleting of logs be possible.
We send out fresh coins thats been aged and mixed before dispensing
There are NO fresh coins at your service, and that was proven several times.