Hello everyone.
I really need your advice to sort myself out of some kind of trouble I put myself in.

I got a schegen visa for Germany, duration of stay was 7 days and 21days validity.
Since I am a JJC in international travels, during my visa application, I filled in the exact dates on my travel itinerary as my entrance and exit dates, hence the 7 days that was given.
I missed my return flight to Nigeria which was scheduled for the 7th day and rebooked for the following morning as there was no other flight for that day.
Missing my flight got me completely flustered and I didn't even remember that my visa was to expire that same day, so I didn't report myself to the immigration check, I just left the airport and came back the next morning for my flight.
To my greatest shock, at the passport control point they took me to the police office and told me I've committed a serious offence in Germany by exceeding my visa stay. They gave me a form to fill, asked me why I overstayed and what I do for a living. I explained that I missed my flight cos I didnt have enough time to pass through the security check and meet my flight.
They made me fill one form like that. And advised me to get to the airport at least 3 hrs ahead of my flight next time.
I was really scared and asked them if they were going to let me return to my country same day or they want to jail me and if the form they asked me to fill means I should indicate I am a criminal in their country in my next visa application�� They said no, that I shouldn't worry, as this was a minor offense, that during my next application, I should clearly state and explain the circumstances that led to my overstay and I will get my visa.
Okay, they did not stamp anything unusual on my passport, but I am still worried cos I need to travel early next year and I'm not sure what the penalty would be for my offence.�
Someone advised me to write a letter to the German Consulate in Nigeria and explain what happened so that by the time I get there for my next visa interview, they'll already have my explanation on their file.

What do you guys advise? Should I send the letter? Should it be an apology letter or just an explanatory letter as I have been advised?

Please @justwise and other experienced people, I'd appreciate a response from you.

Thanks

Thanks and God bless you real good. @breadplanets, I followed your recipe using yogurmet and powdered milk, the result was simply awesome!!!!!!!! soooooooooo creamy and smooth. I didn't even expect such great result when i started off, in fact Farmfresh and Habib are learning...LOL. I got the yogurmet from a shop at ojota where they sell baking ingredients and other chemicals for making soap. I saved some of the yogurt i made for subsequent batches and they take a shorter time to set. I just pour the warm milk mixed with the yogurmet into large empty eva water cans and emerse in a cooler filled with warm water and cover for 6 hours or more depending on how sour i want it to be.