First of all you should check if your server is still fully managed if you do not have your control-panel anymore, many companies only deliver fully managed servers if cPanel or another control-panel is installed, as this makes the server administration easier for them.
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I would say if you are not using it why pay for it. The different programs that come with WHM/CPanel can use many resources. If you just need apache, mysql, and phpmyadmin you could probaly ask your provider to simply install those for you or do it yourself.