Nagging bitch
A nagging bitch is like a broken record that won't stop playing and you can't even find the button to stop it.
'I know you're mad, but I'm still going to send you 100 messages about it.'
'You didn't even reply to my last 10 messages, so I'm sending you 10 more.'
'I'm not done yet, so you better keep listening or I'll scream in your DMs.'