Unprofessional treatment

<p>I have been paying Nimble Collections and my payments does get updated on their app as downloaded. To my surprise the R&T collections keep on calling me and have different amount as my balance. They are using the same reference number as Nimble but yet they say they have not been receiving any payments from me. </p> <p> </p> <p>Who is Nimble and who is R&T that keeps on calling me saying I need to make arrangements?</p>