If it's some scary-looking weirdo salesman, call me right away, okay? I'll send them packing.
Literal
Scary-face-[attributive-の] weird [attributive-な] sale [if-だったら] immediately me [object-を] call-[gentle-command-なさい][confirmation-ね], drive-back [give-てやる][because-から].
Tough older-sister speech. 強面 ('scary-faced, intimidating-looking,' often written こわおも or こわもて) is a set word. アタシ is casual/feminine for 私. 追い返す ('to drive back, to send packing, to turn away'). ~てやる is the benefactive for rough/masculine-tinged 'I'll do X for you' — assertive.