Here is a rewritten title in a formal tone:

Disinformation and Social Polarisation in the Context of Migration

Here are a few options with a formal tone:

1. SOTS and Candelora Accuse Each Other of Voter Misinformation
2. SOTS, Candelora Trade Accusations of Voter Misinformation
3. SOTS and Candelora Exchange Accusations of Misinformation

Here is a single, formal title:

“Social Media Enhances Democratic Engagement, Yet the Pervasive Threat of Disinformation Persists”