Update:
I got a call from the Mac Shop today saying that the whole bottom cover has to be changed. The price $130.
So I told them I'll call the technical department and see things myself. I was surprised to know that the macbook wasn't sent the first time to the apple technician (interlink), it was tried to be fixed at the mac shop in dbayeh.
When talked to, the technician told me that it was bound to happen, and the cause was water, and soon after overheating which led to the bubble.
I have some pictures showing the bubble how it was before and how it is now.
I'm going to talk to the assistant manager of the Mac Shop tomorrow explaining to him the problems.
-Salesman forgetting to send laptops to the repair shop.
-Salesman trying to fix the laptops at the shop.
-Salesman giving prices from their heads.
I'm so sick of that. It's a disgrace for Apple.
The way it was:
You can see how small the bubble was. (before sending the laptop)
How it is now: