A terrible experience so far and I find…
-------Update Nr. 1-------

 N26 team reply here says, " if you have permanently moved from a supported country to a country in which we do not operate, your bank account must, therefore, be closed," however, it was not permanent, obviously. Nonetheless, even if it would have been, no one from the staff has ever bothered to ask me whether it was temporary or permanent! Was I informed about this back then? No, I was not. The email exchange, luckily confirms this. In addition, being that it was temporary, does that mean that the bank can reopen my account? Highly unlikely. 

The bank says "If we have had no response for a prolonged period of time about the negative balance, we may then have to pass this on to a third party agency to collect these funds," yet, I have clearly asked the bank for instructions and alternatives back then, I have explained my situation, thus my question, was not the staff supposed and obligied to provide me with the information regarding the possibility to set up a repayment plan?

Still, I will wait for an official  response to my email regarding my request. I will update this till all this ends, no matter how long it takes. 

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A terrible experience so far and I find it crucial to share it. 

Through the course of April and May 2019, I have had dozens of long calls and more than ten email exchanges with the staff at N26. In the end, after they were not able to resolve my issue and enable me to have access to my account, they terminated my account with the justification that "you have moved from Germany to country X". 

N26 closed my account just like that, out of nowhere, and at that point, I had a debt of 250 Euros (overdraft). I could not log in anymore in my account, and I could not generate QR codes to top-up my account. Being that my other bank account was located in a non-EU country and did not support SEPA and neither Transferwise nor Paypal, the transfer cost of 250 Euros to close my debt would cost around 30 Euro, so, Euro 250 (debt) plus Euro 30 (transfer fee) equals Euro 280. That was not something I was willing to do. I was never offered another alternative to paying back the debt, besides receiving two email reminders. NB! I was not informed about the possibility to set up a repayment plan to do that as soon as I had access to the EU banking system, as I do now.  

Recently, I was contacted by a German debt collection agency, in German, a language that I do not speak nor understand, asking me to pay back around Euro 370. I will not negotiate with e debt collection agency as their claim is baseless, considering the responsibility that N26 had in the way they handled things (I have all the email and transcripts); thus, I contacted today through email N26 with a repayment plan proposal to repay my debt on May 25th, 2020, as like a said, now I have access again in the EU banking system, and I could sort it quickly. However, based on my previous experience with them, I do not think they will cooperate and neither provide an alternative. Remains to be seen and I will update this post as soon as I get an answer.