The worst customer service experience ever

I’ve been receiving threatening emails from Daly about a loan that I’ve been paying off at Standard Bank. At least once a week (7 days) some rude guy calls and he is so abrupt and dismissive and he just demands my ID number and when I say no he must read it out to me he becomes even more rude. Now I understand a debt collector can’t allow a customer to come up with other stories but I sincerely believe that having telephone etiquette goes a long way. If it is a call centre they need to train their people better. I’ve explained my situation numerous times to Standard Bank before. Daly is supposed to contact me to confirm and reaffirm the arrangement and ensure I stick with it.. not just call me and threaten me around every corner. I am appalled by this horrible customer service I’ve received, keeping in mind that I’ve been honouring my payment arrangements with Standard Bank.