Leaking coolant

I’m looking for any kind of answer or help. So one night I was driving and it overheated all the way to the top of the temperature gauge like beeping can’t go any further so I stopped driving and had it towed. The mechanic said I need to replace the intake manifold gaskets it was $730.00 so we did that but before I did I asked him was there any other possible it would be happening he said maybe a blown head gasket but that he couldn’t check until the manifold was fixed so he fixed it. I sent my friend to pay as I was working. I go pick up the car within 10 minutes it overheats. I live close so I make it home not long after and it cools downs and there’s a big puddle of coolant underneath the reservoir again. I just don’t understand and feel taken advantage of. If anyone can help I would greatly appreciate it.