My two cents.
First of all, congratulations on the birth of your son.

If you change any personal information (in this case you lost access to your Telegram account), it's your responsibility to inform the people you do business with of the change. You can't expect other parties to go on a hunt to try and find you. You didn't inform Alex in time. He sent a message to you, telling you that the service is about to expire. He sent a second message when it did.

You can argue that the rules about what happens with the money after a card/account expires are vague. It doesn't mention that you will lose access to the money. It also doesn't say you will get anything back. Alex provides a guarantee that the service will work while the subscription is active. After your subscription expired, so did the guarantee.

You mentioned a few times that he took the money. Someone correct me if I am wrong, but it's the nominee that gets control of the funds once subscriptions expire. That's what Alex said at least.

Since you have used the service in the past, he could have done better and made a deal with you and offered you something in return. I think that would have been a better choice. Still, I don't think this is enough to be considered a scam.

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You paid for a service that worked while it was active and under guarantee. It stopped working after it expired. At that point, the service provider has no more obligations towards you. According to Alex, you even used it a bit after the expiration date. I am not sure how this is possible. 

Alex informed you that the service was about to expire. You did nothing. He informed you a second time when it expired and you only responded two weeks later. It's your responsibility to keep your accounts safe, and in case something happens, find a way to get in touch with the people who do business with you and need to contact you. You didn't do that.