I am only an F-Secure user (their home solutions).
It is a bit tricky situation, I think. In general, the most useful action after finding a trouble is to contact F-Secure Official Support channel (for example, web chat): https://www.f-secure.com/en/home/support/contact (and to provide enough arguments that you are 'original' owner of account). It is also useful if your email service provider decided to stop offer solution (and so on).
But could you explain a bit, because topic title and discussion part with two different situations, perhaps. I mean: