Poor service from Manager at Menlyn Mall

Terrible service at Menlyn Mall from Manager that refused to give her name to me. I took a shirt back that the material was defected and was told it was my iron that burned the shirt. I asked the manager that didn't want to give her name to me whether she can please send the shirt back for analysis which she refused as she had already made a dicision. I would like to know whether your managers are trained in textile quality control as I find this unacceptable. She was totally unprofessional and would recommend retraining in client services as she lacked in handling the situation very unproffessionally. I also felt embarrassed as she accused me of burning my clothing without further investigation. I tried to call your helpline which also failed to be answered after holding for 20minutes. I am appalled by the lack of service from H & M and would in future not be purchasing their merchandise