Hostingraja.in — My Website is down after migration into HOSTINGRAJA and no support by technical team

Hi Team,

My Website (wayofpleasure.in) was working fine with old hosting provider SiteGround, but after site migration by HOSTINGRAJA Technical team my site is not working some time it load page after 5 min and keep getting 500/400 server unavailable.
Now Technical team is saying that you have to optimize your DB but I want to know how my site is working fine with old Hosting provider.

If you can not resolve this issue, so please cancel my plan and revert my many back