Brand new toilet all connected plumbed up no leaks from toilet but has a whole on left side looking from the back made in to the toilet pan and is leaking water out of it should this happen or is there a bung missing
I assume you mean the cistern? If so there are normaly 2 holes, one for water to enter the cistern, and sometimes there is an additional one for toilet over flow dependant on the toilet.
A picture would help of this isnt what you mean.