Consumer Redressal

Hi, I had purchased a tablet from Univercell and within the warranty period the tablet had some issue which I had given back to store (First week of September 2014) for get the issue fixed. The store Manager (Suresh) had informed that I will get the tablet back within 7 - 10 days. but it is more than 45 days and still they are struck on Friday (God knows which Friday). Still no one is taking responsibility to get my issue sorted. I followed the hierarchy: contact the store first, then the store manger, then ASM, then the helpdesk and finally I sent an email to MD. But still no one is responding. The conversation I had all this period I have it recorded. Only fake promises no action by any level till date. I don\'t know where my tablet phone is? and what this people are doing on this. I doubt whether the aligned people have the knowledge of the level they are on and the responsibilities. I need to file a case against this company and need some better suggestions.