Huawei bad repair service

I have had a huawei P10 plus for the past two years last year I had a problem with my camera so I took it to the repair center in. Melrose arch. A week ago the phone was pulling part top from bottom took.it to the melrose repair center and was advised its moisture damaged and that they can pick up any past repair on my device. They could not pick up anything . I escalated and on tuesday Ida advised me to take it back which I have.done to get a quote this morning of R3700 to fix the mother board which like mbali said it normally happens its like a.computer the mother.board.heats up and is damaged. Now this morning they could suddenly pick up the past repair but cant give me the details.I need assistance with.this matter.urgently