Hello at AWS my name is Tinashe Paul i work on a certain company called Kulipay in Zimb...

Hello at AWS my name is Tinashe Paul i work on a certain company called Kulipay in Zimbabwe. The company is builting the chart bot which does some payment method s so the issues is the paid for the server to make the system access very well but at a certain time the guy who was the programmer of the system quit Job for some certain reasons about the sallary method and he is untouchble and unavailabe now he is the only one person who was able to access the instance and he is the only one with keypair. So my question is is there is any solution or way for us to get read of the system and how can we get the keypair while that guy didn't tell or share the with anyone I need serious if there is a solution this a chance for me to prove the possibility to the company. looking foward to your help