Pathetic Service from collection company

I dont know why you chose ARA to do your collection those Agents are RUDE and their system is not updated my Mother had an account with you and paid every month some time in July /August she was offered a 20%discount to settle her account so we tookit and paid and sent POP on the 4.08.2020 to date we never received any thank you or email confirming account was settled instead we get numerous calls fro ARA my mother's id nr is ***