Angry, frustrated and very irritated

Mbd sent an sms of what I should pay them of which I called Wednesday 19August 2020 to confirm their banking details and transfered the money that I was told about. Suddenly today they call and say I still owe 500. They are trying to reap people of.. The gave an amount and I paid next thing I still owe... I sent my proof of payment so please remove me from ur data base and clear my name