I can't disable my 2FA in any way. If I try without the secret code and with my registered number, I get the following message: The Nexmo platform could not process this message for the following reason... but it doesn't specify any reason.
On the other hand, if I try to reset it and say I don't have the secret key or the phone number, it throws up this message: Sorry, your 2FA can't be reset now because your last login country is different from your current country. Please try resetting your 2FA from the same internet connection as the last time you used the website.

Ayuda por favor!
Currently, no one can help you here about this issue because it's all about you and your phone as you mentioned support is also not helping you about anything then just limited chances here I notice in last few days their new representative who is taking care and posting about updates.
https://bitcointalk.org/index.php?action=profile;u=76651 if he can check hopefully he will give you any update or just send him DM maybe he will give you any information about your issue, and you could be able to have restored your account without any more trouble.
You have posted a link to my profile but I am not a representative.
Your post history clearly saying who are you, and what are you doing here with this link please check you are already saying back here
https://bitcointalk.org/index.php?topic=320959.msg65194901#msg65194901 can you give explanation about this what is meaning of this?
I think you are scaring about if you will openly talk about this maybe someone give you negative feedback hopefully this will not happen if you give better updates about this project.
Sorry bud, but NABiT was never and has never been a representative of freebitco, atleast, I've been active on this thread for several years and to the best of my knowledge, NABiT have never acted or officially claimed to be a representative of this casino, there must have been a mix up somewhere and the link you shared here which leads to one of his comment from way back was him letting the community here know that freebitco site was up again and working after the site was down for a some time.
I know someone else who acted as the representative of the site but unfortunately, I've forgotten his username, I will have to dig and bring his profile up as I remember he as made a couple of comments on this thread some time within this year, as for NABiT, forget him, he's not a representative of this casino please.. 😁