Best Every Plumbing Problem in Los Angeles CA

Recently had Express Electrical come to my home to try and diagnose a very odd electrical issue I was having. After 20 minutes of the tech looking through my main and sub panels he came back and told me I had a voltage drop but he didn't know where, but he had 3 options. The first option was a $11,000 overhaul of my entire main panel. The second was a $6,000 repair and the third was a $4,000 repair. How can he have given me repair estimates without even knowing the problem? I explained to the tech if the repair was going to be that much I would have to go through my home warranty. He then tried to convince me that I should just authorize him to do the repairs and the home warranty would reimburse me. I told him that is not the way home warranty companies work. But then he had a fourth option, he could give me temporary power for $1,100. How could he give me temporary power if he still didn't know what the problem was? I paid the $50.00 for the service call and thanked him for his time. The next day I called the people who installed my solar and they sent someone out to see what was happening. Come to find out it was a corroded main breaker that was $350.00. I cant believe the way this company tried to rip me off. I live in a nice house and the tech thought he saw an easy mark. Stay away from this company.