Can I please get a response for my settlement lett

Ever since the move from Nashua mobile to MTN, and the whole 'open line' fiasco, I have been requesting for a settlement letter since the 12th of March. I sent an email, thrice to their [Email Removed] I have two reference no.s that haven't been responded to, have been calling the call centre countless times but it's a mission just to get through to someone who will just say \how can i assist". I don't if people are on leave or striking that no calls are being attended to. Can I kindly have a settlement letter for acc no N***. This is my last resort before I go directly to an mtn service centre just to get a settlement letter when they have all these avenues but they are slacking on working on it. Then why have automated emails and call centres if no one bothers to attend to queries on that platform. I have sent queries on Twitter but again"