Aloi They ban VOIP numbers, use an NL one. Its a lower chance of having your account banned because apparantly they have no way of differentiating virtual and prepaid numbers there.
And use a residential proxy during signup, normal VPNs are typically flagged and will either cause your account to get banned or given the message that the code has been sent to "another telegram device"
Edit: Didnt see your most recent post, in that case you are either device or IP fingerprinted.