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I'm afraid you would have to create a new campaign (you can just archive that wrong one) this is because Moz crawls that URL so if you were to change the URL the previous crawl would be wrong. it would get very confusing have more than one website in a report so its easier to just create a new report. Hope that helps.

Regardless of what the competitor is doing, it does not violate Google guidelines to put a phone number in a meta description. You can put whatever text you want -- especially since the meta description is no longer a ranking factor. Putting the phone number there can be a very good idea -- it minimizes the distance between the prospect and a salesperson. However, the issue is that such a scenario is not easily tracked in analytics (and it probably cannot be tracked at all). I'll post a few links have on how to integrate phone-based inquiries with Google Analytics: How Call Tracking With Google Analytics Increases Your Profits Mobile Calls Are the New Conversions I hope this helps!