Can my Viber account be hacked even after deactivated?

[Windows Central Question]

Hi,
I have deactivated my account for a personal reason and i',m going to delete my viber app from my android phone...
so after i deactivated my account how would i know my viber messages,images sent and recieved through the viber would be permanently deleted on your servers that no one will be able to get access?
or is there any time period that required to delete data from your all storages?
please be kind enough to reply me with an answer.

Thank you..