Asked out by call centre agent and payment arrangement not honoured

I have a personal loan which I cannot pay in full per month as I am home on maternity leave received call from Zaahid to make arrangements. I explained that I will be paid 30% of my salary from UIF and will pay the same percentage to them per month. He agreed and set it up for the next 6 months. Zaahid then whatsapped me the same day asking how I was doing etc. Since I didnt have his number I had to search and find out who this was. I told him it was ******* to be on my whatsapp, that means he is *****ing personal details from clients! Yesterday, the full amount went off via debit order :(