I've left notes like that on car windows before. and parked the f**k*rs in. There is a whole almost unused section for visitors at the bottom of our road and some unused spaces in the residents section. Dipsh!ts still parked in my space so got blocked in. Sometimes they still managed to get out

I'm not the only one to do that either.
contact the landlord to find out which spot is yours and which isn't and ask him to contact the Fiesta owner in bay 7 to move it if it's not their bay.