bad service

i walked into a mtn store in campus square auckland park looking to buy a screen gard on black friday the 24th a sales consultant by the name of chongo mubanga assisted me she had put the screen gard on my phone i paid R299 and i left a week later on the 30th november 2017 the screen gard came off i took it back spoke to the same sales person telling her the thing came of asking me how did it come off with a very bad stinking attitude the screen gard cracked in the right top corner from not being put on right,shame made fun of me for the screen that was cracked to her friend who is also a sales consultant at mtn chongo the sales consult who assisted me had put the very same thing back on my phone while making fun of me cracking the screen a day later the screen protector came off again i do not appreciate the type of service mtn sales consultant is giving now a days i mean its my money i am paying for it they not doing me any favours no wonder i would rather buy such things on the streets there products and sales s****s is far better then what you get in the stores rude sales consultants is not good for business so i would like to advise mtn customers to be careful of such