Unprofessional MTN - made a mistake and have to suffer

I called MTN direct to have my contract upgraded. And i took a special of P20 lite that comes with ********** And when i received an sms for dispatch i realized that it only the phone with no router. And i called back the gentleman who was my sells man and he acknowledged the mistake and said it sorted. And when i received my parcel it was only a phone and simcard still no router. Again i called him and he said MTN made a mistake they were not supposed to dispatch a cellphone, so now i have to return it back to them inorder for them to be able to issue the router. And that to me does not make sense, however i returned it. And now i am waiting with no cellphone for MTN to receive the phone back, capture it on the system then issue me with a new cellphone that comes with a router. And i asked if it possible for them to cancel the whole thing and go to the nearest MTN and get a cellphone and they said NO. So now why do i have to suffer for MTN's mistake. Now i am using my sons cellphone. Please assist urgenly