There are some good Water Conditioning Specialists, Plumbers and Well Pump Contractors but you will need to search to find them. A quality contractor would likely be accredited and in good standing with the local Better Business Bureau so start there. Or Google WATER CONDITIONING PROFESSIONALS NEAR ME" or "PLUMBERS NEAR ME" or "WELL PUMP CONTRACTORS NEAR ME". Also look at their Google reviews if they have a web presence. If they are a viable company then they should have a website as well.
Get at least two estimates over the phone which should include their normal service call rates. If they will not give you their hourly rates over the phone, call someone else. Tell them what type of system that you have. Ask how many years they have been in business and ask for an experienced water technician/installer.