Mobicell

I dont get help from mobicell about my phone after yo talked to them,now they are coming with stories,they are saying my phone had a liquid and i have to pay for it..and before they took it they checked it..I dont know anything about liquid,the phone stopped working.And when i switch it on it will be on with a red light.

Why do i have to pay for something that is not my fault is not working and it still under warranty..im so frastrated right now i dont know what to do.And they say they cant fix the phone without any payments.Please help