I've been designing (my personal projects) for the past 6 years and recently I started designing logos for clients.
Now, there is this client who wanted a logo. I took 6 days to submit 1 logo and 1 day to submit 5 variations (totally different) of that logo upon rejection (PS. all 6 were standard).
Finally, he selected the last one (IT'S STILL THERE AS HIS LOGO IN HIS WEBSITE) and when I asked for my payment, he started "abusing" me over phone claiming that I delayed his project (He never mentioned any deadline). Since I'm a beginner, I didn't know that I had to sign an agreement before hand. But, I have the PSD file, whatsapp conversation with him and a screen shot of the logo in his website. How do I deal with this?