1993 Lincoln Town Car Leak in Manifold

Engine Mechanical problem
1993 Lincoln Town Car V8 Two Wheel Drive Automatic 192K miles

I have a leak in the hose to the mainffold. A mechanic tried to fix it to the tune of $500. Saif it need a pipe whic was/is rusty and a hose. It took some 4 hrs plus to do what he did. He told me to use the present 'PIPE" they shortened it and added a longer hose.
I came home with it this evening only to find the damned engine leaking like mad underneath.
Of course I'm returning to the mechanic to get him to correct the problem. He sys it's fifficult to get a new pipe.
what's you solution? Thanks Out $500. Carmen V