"Repair Assassins" raise prices at the same price. How can consumers avoid "falling into traps"?.

According to our newspaper (Reporter Tao Wen), when I placed an order for waterproofing and leak repair for 10 yuan, I was charged 7,300 yuan at checkout. The 50 yuan mentioned on the phone for door-to-door unlocking ended up costing nearly 1,000 yuan... Around the Spring Festival, high-priced repairs frequently occur. What I thought was an ordinary repair, why is it so expensive? How can Consumers avoid "stepping into pitfalls"?