Trackback Spam : delete wp-trackback.php and still receive spam ?

Hi there, i see you thinking : not another post about trackback spam ?

My comment spam is handled effectively by Spam Karma. Great. My trackback spam seems to get in my database, without passing Spam Karma, for some reason ?
All my posts have their ping-status set to closed (so no trackback or pingback is possible, i assumed).

I have now finally *deleted* wp-trackback.php, which would, if i understand correctly, all possible trackback spam completely. But still i receive trackback-spam, is their any other way they could access, say my wp-config.php … could they use their own php, include my php scripts in their ? and run the their own wp-trackback on my database ????? Just guessing here, because i got no clue.
And how could i stop that ?

Any help would be greatly appreciated ??

Nathan
https://nathanvda.dixis.com