Bad and incorrect Customer service

I upgrade my contract by mtn for a samsung 10 plus. The screen got a small chip next to the power buttom and turn white. I have all my respect for samsung. And i ask the sales lady by mtn if something happen to the screen will samsung replace the screen just to make sure again. Cause i know samsung replace 1screen for free. The phone was not even a month old. I went to samsung and they did inform me that they only replace screens till samsung 7. I complain by samsung head office regarding the screen replacement. They told me its mtn problem. Mtn tell me its samsung problem. So i feel that samsung didn't inform mtn or other networks that they only replace screens untill samsung 7. Now i must go up and down from samsung to mtn and back cause no one want to replace my screen. To replace the screen its R8000. Its very unprofessional for mtn and samsung by not informing clients that they only replace screens untill samsung 7. And to send me around from mtn to samsung and back. I did take the sales ladys word when she told me samsung give you 1 free replacement. I did ask her just to make sure. I do have all my respect and trust in all samsung items and thats the only items i have in my house. I am realy unhappy regarding this matter cause samsung and mtn are waisting my time. I feel on the end of the day samsung and mtn must communicate to each other so that mtn staff do know how to give the correct information to the client. If i know about this i would upgrade to samsung 10. I would rather get another phone. I am very disappointed in samsung and mtn. Natacha Erasmus ********** 888