Sony India — Sony Xperia ZR cover opening repeat from charging point area

Address:

Hyderabad, Andhra Pradesh

Dear sir,
I purchased Sony Xperia ZR on February last week 2014. am facing a problem that my phone cover opening repeatedly from charging point. How your company manufacturing this water proof mobiles i don't know. Why you are wasting our money?. You are the best branded company, you are not maintaining standards. Now this phone water proof or not?. Now what can I do?. Please suggest me what should i do. how can you solve my problem?.