Klaviyo SMS Number Migration Help

I recently left Privy for Klaviyo and brought years’ worth of mobile numbers gathered through my online sign-up forms and at live events. Klaviyo is rejecting every one of them, so SMS can’t be activated and my whole launch plan is on hold... (Budget: $30 - $250 USD, Jobs: Analytics, Compliance, Data Analysis, Data Entry, Data Management, Digital Marketing, Email Marketing, Klaviyo, Lead Generation, Technical Support)