Two years ago, my grandfather passed away. I was working in marketing departmen at this  small branch office of a huge company that sold soil fertilizers at the time. I could not attend the funeral since it was what we call busy month. But I promised my upset Dad that I would take a week off and visit grandpa's grave the following month. 

My general manager was a tiny man with some bad tempers so I submitted my leave request when he was in a good mood. But he refused my 7 days off request and trimmed it to 4 days only. (Take it or leave it he said). I tried talking to the human resources about it since my grandpa was buried in a remote village and it would take me 48 hours to get there by bus from the nearest airport. But my manager would not approve it. 
So I flew back home and found out there had been a fight in my family concerning the inheritance which included a house and acres of land. I needed to stay there until the problem was solved. So I called the company's human resources to ask if it's possible to get more days off at least until I was not needed to sign some papers regarding grandpa's inheritance.

The company told me it was not possible. There were only 2 options left for me. To fly back to work or to quit the job. I chose the latter since I loved my family and wanted to set things right among us. 
But apparently the company acquired me to go through a one month notice procedure before my last day. This was not written down on the contract though. If I didn't do it, then they would not give me my last salary, bonuses and others included. This upset me since I had worked my ass off for them taking long hours into the night. And as far as this resignation procedure went at the company, nobody else had ever been forced to go through the one month procedure before. It was as if they were trying to get me in trouble or something. But since I did not want to complicate the matter because I was still focusing on my family problem as well, I opted to let it go, though still bitter about it. It was a lot of money to let go after all. 

A few weeks later, one of the company's clients contacted me (not knowing I had quit) regarding some products that had arrived in bad conditions, broken and dented.  The truth is, in a rush to sell them the company did not bother at all to check which products were still in good condition to send.
Because they needed to replace all the old ones left in the store room ASAP, which was one of the reasons why my manager wanted me to come back soon in the first place. 
The manager was well aware of it but one of my colleagues had told me he had overheard him saying 'The shipment is to blame. Just get rid of those craps'.

In a rush of vengeance, I told the client about it. I've heard the manager has been suspended and the client has sued him and the company for it. Now that my family's problem has subsided, I feel a little pang of guilt for getting him in trouble though. AITA here?