The part you plug into the wall is not a charger, and actually neither is the cable. The charging circuit is in the phone. However, the cable and the plug are covered under the same warranty as the iPhone they were supplied with. As far as the cable your father purchased, was that marked with the MFiP certification? If not, that could lead to issues.
Have you checked the charge port of the phone and make sure there is no debris in the charging port? That could cause the cable to not make direct contact and could cause the noise issues you described. Use a magnifying glass and wooden toothpick or some other non-metal object to remove anything there to make sure the cables are making connection. If not, you can make an appointment at the Genius Bar of the nearest Apple store to have the system looked at by Apple. They can explain your options.