High CPU Usage on VPS host

On my VPS im getting a lot of CPU usage (over 90% and higher), and my site goes down.

I contacted support (I spoke to 5 tech guys) and they say PHP scripts are cousing the high CPU usage.

1847 playthi2 38 18 384m 199m 7400 R 19.9 5.2 3:00.84 php

11713 playthi2 38 18 394m 211m 7400 R 15.3 5.5 3:59.70 php

12181 playthi2 38 18 394m 210m 7048 R 15.3 5.5 2:16.29 php

14171 playthi2 38 18 269m 87m 7088 R 15.3 2.3 0:01.79 php

12020 playthi2 38 18 394m 210m 7400 R 15.0 5.5 2:31.31 php

12612 playthi2 38 18 394m 209m 7048 R 15.0 5.5 1:56.11 php

14175 playthi2 38 18 278m 95m 7044 R 15.0 2.5 0:01.39 php

14179 playthi2 38 18 269m 86m 7012 R 15.0 2.3 0:01.15 php

12359 playthi2 38 18 394m 208m 7044 R 14.6 5.5 2:07.51 php

14218 playthi2 38 18 265m 83m 7012 R 14.3 2.2 0:00.75 php

14222 playthi2 38 18 235m 53m 7028 R 11.3 1.4 0:00.34 php

14224 playthi2 38 18 207m 25m 6932 R 5.3 0.7 0:00.16 php

When I run a process manager in WHM it says the wp-cron.php and index.php are cousing over 90% CPU usage.

Last night i added define('DISABLE_WP_CRON', true); to wp-config.php but it didnt help.

Plus I deactivated all plugins, and changed theme - didnt help too.

Traffic didnt go up too.

Please guys can someone help me