Waterproofer is costly?

Hi all, I'm Robert. Recently I bought a house in Oakville. Yesterday I found leakage in the basement. I searched youtube videos about how to fix it. But I fail to fix it. I am looking for waterproofing services in Oakville. I saw a Facebook ad about Pro waterproofers. I loved their services. I am not familiar here, Does anyone know them? How is their service? Is it costly? If you know them before please comment below.