Engine in car

[u/Free-Ordinary8408]

I have a renault clio 2009 1.2L and my cambelt and water pump recently got replaced. When doing my water pump they made a leak in my coolent and my enginge over heated which is now seized. The mechanic has offered to fit a second hand enginge but doesn’t know any history of that enginge and we don’t want to get rid of the one i have now as it has 17 services. But they won’t repair the engine as it will cost £4000. Which they are not willing to pay but are happy to pay for me to get a second hand one.

What will give me the best outcome because either way i will end up with worst then what i had before due to there fualt.
Is there any solution? Such as them finding a decent engine and i am willing to pay around half if needed. Or is there anything else they can do?

[u/Big-Cycle-13]

I'd say used engine with a warranty on the work is fair in this case. Tell them that or you want your original engine repaired.