All my Google reviews are rants from costumers that I've never seen

Report each review as irrelevant?

Well, if you have any competitors, pay to leave fake reviews on their Google listings :P

Is your business named something confusing? Is the marked location wrong?

Normal businesses don't have this issue, so I would suspect that your listing is really confusing if the majority of your reviews are for a different business than yours.

Maybe you just didn't recognize them in their costume.

With as little details as you have provided, it's extremely hard to give you a helpful answer. Maybe share a link so people can see the reviews themselves?

Ask the to say when they were at your business and why they interacted with on the comments. At least readers will see it.

First, need to gather more info. For example, we in Ukraine few years ago seen huge number of fake reviewers from India, few times more than Ukrainian market, and in most cases just prohibit Indian IPs was enough to resolve.