change old gamertag

Dataman95 is actually avaible for old gamertag but obviously no for the new gamertag because i own it, i know that. My question is if can i only change the old gamertag, microsoft should've think about that instead of charging us 10usd for just change
your name....

Try this: https://support.xbox.com/en-PH/my-account/manage-gamertag-and-profile/gamertag-updates-faq

Hola, si has cambiado tu gamertag y no puedes recuperar tu antigo nombre es aue ya alguien más lo ocupo, peropara que esos numero no te salgan, ya que esos numeros salieron desde la nueva actualización es poner un nombre parecido al que perdiste, ya que
los numeros que se pone son los nombres usados en xbox ese numero es para identificar que es otro más agregado

How can i contact them ? Chat and phone calls are not avaible

i've recently changed my gamertag for the first time (free) to my desired tag (dataman95) , the system add the number #2797 to it, and im fine about it, the issue is that i didn't notice that you can customize your old gamertag, i wanted to leave
it just like dataman95, instead of dataman952797 as it assigned me. The problem is about if i change my gamertag, i'd have to pay, but i cant, because i already got dataman95, but not on my old gamertag , is there a way for a microsoft technician help me to
change just my old gamertag?

No as the dataman95 was taken thats why you were issued the suffix

Thats why the suffix wasgiven ao you can have the name you want just with a suffix

Your previous name will be freed already but as you already have a similar name you will only get another suffix