Resolving issues or complaints with Google Business Profile (formerly Google My Business) customer support involves a few steps. Here’s how you can approach it:

1. Gather Information:
Document the Issue: If it's about missing reviews, take screenshots of your profile before and after the change if possible. For other issues, collect all relevant details like when the issue started, what exactly is wrong, and any error messages you've seen.

Order Number or Case ID: 

If you've previously contacted support about this or a related issue, have any case or order numbers ready.

2. Use the Google Business Profile Support Channels:

Online Support Forms:
Google Business Profile Help Center:
Navigate to the Google Business Profile Help Center.
Use the search bar to find articles related to your issue. If no solution is found, look for the option to contact support or submit feedback at the bottom of relevant help articles.
Submit a Support Request:
Click on "Contact Us" or similar options which might appear after you've explored some help articles. You'll be asked to describe your issue in detail.

Email Support:
While direct email support isn't always immediately available, if you go through the steps in the Help Center, you might get an email option. Ensure your description is clear and concise.

Phone Support:
Google occasionally offers phone support for business profiles, but this can be inconsistent.
Check the Help Center for a phone number relevant to your region or issue. You might need to select your country or language first.

3. Contacting Support:
Be Specific: Clearly state what the problem is. For example, "My reviews have decreased from 50 to 45 over the last week without explanation."
Include Evidence: Attach any screenshots or provide URLs where the issue is visible if applicable.
Ask for Escalation: If your issue isn't resolved through initial contact, politely ask if your case can be escalated to a higher level of support.

4. Follow Up:
Check for Updates: Keep an eye on your email or the Google Business Profile support dashboard for any updates or requests for more information.
Be Patient: Resolution times can vary, especially if there's a high volume of requests or if the issue is complex.

5. Additional Tips:
Profile Verification: Ensure your profile is verified. Sometimes, issues can stem from verification status changes or updates.
Community Forums: If official support is slow, consider posting on Google's Business Profile community forums for advice from other business owners or Google product experts.
Check for Known Issues: Sometimes, Google acknowledges widespread issues through their official channels or social media. Check these for any announcements that might explain your problem.
Professional Help: For significant issues impacting your business, consider consulting with a digital marketing expert or a professional who specializes in Google Business Profile management.

6. Preventative Measures:
Regularly monitor your Google Business Profile for changes or discrepancies.
Educate your customers on how to leave reviews that comply with Google's guidelines to avoid future removals due to policy violations.

Remember, patience is key when dealing with large tech companies like Google. If your issue isn't resolved through one channel, try another or follow up on your existing complaint.