Unprofessional

My husband has made an arrangement on his arrears account and the payment was made but each time consultants call and drop the line when we pick up.They would call to my work number and when I pick up they would drop the line. This morning i received a call to my work number asking for my husband,i then asked if its MBD and the consultant rep**** "yes'.When i told her that i transferred the money as per arrangement she dropped the call. In addition i have been disputing another account which they stating is in arrears but we have a settlement letter for the account of 2019. MBC fails to respond to queries timeously. They very unprofessional.