I suppose that is hardly believable as all JetBrains products are, to my knowledge, available only here:
It would be also very helpful, if you would explain, what exactly you tried to do.
Usually, JetBrains installs their products with shell scripts or you just download a folder with a run.sh in it and run it just like that, without any installation.
Therefore, it would be nice if you would list all methods you tried to remove the installation, as you probably haven’t tried the most obvious one:
Delete the PyCharm folder.