The phone number +373 (237) 6-64-84 is being used as part of a Wangiri scam. If you get a missed call from this number then do not phone it back as it will invariably run up huge charges on your mobile phone bill.
Victims have reported being left a one-ring call from this number. In fact the callers do not want you to answer. They actually want you to phone them back. Anyone who does phone back will be connected to an international premium rate phone number. Therefore it is very important that you do not respond to this call. Instead you should delete and block the number +37323766484