Stinking attitude by manager with false accusation

I bought an iPhone 6s phone pouch (product name - \muvit"). After roughly 2 weeks the pouch starting breaking on the corners. Chunks of plastic on 3 of the 4 corners started breaking and continued to break as time went on. I went to return the product and the store manager blatantly accused me of dropping the phone on the floor. I told her that if my phone fell so many times"