Unhelpful and Rude

I made a booking 3 weeks ago for myself and had to add a minor a few days ago. When I purchased the ticket for her I was advised to check in online so that we can both have adjacent seats, as that option opens 24hrs before scheduled flight.<br> <br> I checked in myself okay but when it came to checking in my daughter there was a problem. Firstly never try call Mango Airlines Call centre after 4pm, you will not get any assistance as they don't pick up, yet it's before closing hours.<br> <br> Needless to say the call centre could not help me and they referred me to their office Guest Care where I spoke to a Mashia who was VERY rude and abrupt. She spoke over me without even offering help.