Incorrect phone and package delivered but MTN ignoring my calls to resolve this mistake made by Nicolette Naidu

im so angry right now i upgraded on the 10th of May 2018 spoke to Nicolette Naidu i ordered iphone 8 64g for 559.00 the lady was so firm with me that i must make sure that i order the correct phone as the process to return the phone is tedious and long which i did then today i receive my phone its a wrong phone iphone 8 plus on 256g package i call her now she cant remember well then i should just return the phone.

i asked to speak to her supervisor who couldn't come to the phone or take it as she was busy Nicolette asked me to send her an email then she'll discuss this with her supervisor but the hole day she has been avoiding my calls its 6pm nobody has returned my calls after i called 4 times leaving messages for these 2 ladies .I've explained to this lady why i needed the phone urgently as i deal with customers and cant afford not to have a phone after i broke my phone and this is what i get??MTN lacks client centricity and service what am i expected to do just take this and shut up????????????or waste my time which i was warned against can someone respond to my query urgently!!!!!!!!!!!!!