ANGOLAN billionaire Isabel dos Santos, daughter of the country's former president, faces being dragged into a $400 million London lawsuit brought by Angolan telecoms operator Unitel. Unitel sued dos Santos' Dutch company Unitel International Holdings (UIH) in 2020 over loans provided to fund UIH's acquisition of shares in telecom companies. The loans were not repaid and around $395 million plus interest remains outstanding, Unitel's lawyers told London's High Court on Tuesday. Unitel is applying to personally add dos Santos – Africa's first female billionaire, whose father Jose Eduardo dos Santos ruled Angola for 38 years until 2017 – to its…