Penta tab undelivered product and fake promising

Respected sir, I made payment (3500/-)For purchasing tablet pc from pantel technologies on 15th may 012. At that time the company promised me that I will get the tablet on 30th may. Then I called to customer care no. 4-15 times and spent my 00/- No phone call. Every time they were telling me that I will get my tablet within a weak, this is happening since 1.5 month. And most of the time they were not replying me. Please do the need full.... thanking you.......