Hello Sobia
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I last used my Hotmail account about 7/8 years ago.
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Before continuing, just so there is no misunderstanding, this is a public user-to-user support forum. We're users just like you helping other users. We don't work for Microsoft and have no access to any user account so there is nothing we can do or check from within the forum. We have no input on Microsoft's policies and procedures. Microsoft Support personnel do not staff this forum.
Now for all the bad news.................
Any account that has not been accessed within the last 2 years is automatically deleted due to inactivity as per the Microsoft Account Activity policy. Once an account is deleted, it can never be recovered/reused by anyone again. There are no exceptions or work-arounds to this policy. I have no idea why anyone from Microsoft who helped you fill in the recovery form didn't tell you this right from the beginning. Even if you could get your old phone number back, it wouldn't have the slightest bit of difference.
Since you also stated that you sent a message and did not receive a bounce back message, if the account still actually exists, would mean that it was taken over by someone else and after this amount of time, there would no way to recover it.
One last piece of bad news is, ignoring everything above, if the account is still active but not accessed within the last year (but less then 2 years), then the only way to log into to the account is to use the correct password for the account - the recovery form doesn't apply in this case nor can it be used if 2 factor authentication was enabled for the account.
Microsoft account activity policy
https://support.microsoft.com/en-us/help/451105...
After all of this, Microsoft recovery policy is such that no one from MS can reset your account, it can only be done by the owner of the account.
Realize that this is not the answer you were hoping/looking for but it unfortunately is the only one that applies to what you have described