Making their problems your responsibility - risk to your credit

Same issue as Lelane K: paid an amount due, but Discovery can't track it on their end in spite of me sending proof of payment to two departments following MULTIPLE enquiries. No follow up. Shocking service, have received 5 separate reference numbers and keep getting no-reply emails. Now informed they plan to report to TransUnion. I have moved to the US and finding it impossible to resolve from here.