Fitting of a **** installation windscreen

P G Glass Ltt Makhado fit in a **** windscreen on my car and the windscreen cracked within five working days and I immediately visited the branch and the manager confessed that it was due to poor installation and he promised to fit a new new windscreen within five working days. And after five days he changed the tune. Could you pls kindly intervene and solve the problem pls. Lyborn Muthaphuli 072 ********** 660 ********** FW 35 TY GP