The right company will be up-front about the techniques that they plan to use to repair your gutters. Once you've explained the specifics of your situation, reputable gutter repair companies should be able to tell you how they plan to fix the issue, and if the answer given isn't clear, try a different company.
The cost to repair or replace the gutters on your home can fluctuate based on the size of your house and the materials used, but the price for this project shouldn't exceed a certain range. Most homeowners report paying between $1,800 and $2,200 for full gutter replacement, and gutter repair shouldn't cost more than a few hundred dollars. If the quoted price exceeds this range, move on to a different company.
If you end up deciding to replace your gutters, one way to tell if a company is reputable is to ask which gutter materials they recommend. Vinyl, wood, and aluminum are the most commonly used types of gutter materials, and if gutter repair companies try to unduly sell you on the benefits of copper, which costs much more, then you might want to try a company that's fine with sticking to the basics.