Wow, you are very wrong. The landlord simply does a pipe check and clean out after changing tenants, this proves it was you… You know… Legally. That is pretty standard practice. After that, the plumber assesses the cause of the clog. Based on the assessment, misuse can be determined. You have a right to your option, but legal proceedings are independent of your opinion.

But good luck with that approach, and cheers if it has worked so far.