Trai — post to prepaid activation

I was a vodafone customer from 2006 in prepaid mode from this january 2017 i made it in to postpaid but because of downloading 2 games i got a huge bill of 1800/- and continued in the next month also. I paid the total due as on date i. E. On 24.06.2017 and asked the vodafone store staff to change my number [protected] in to prepaid mode. As per my request they had given me a sim for activation in to prepaid mode, but it was not activated as on today i. E. On 15.09.2017. Can i move this matter in to consumer forum or else could you make my problem resolved. Please solve this issue. I am enclosing the bill which i made payment on 24.06.2017.
Regards,
Y. Sreenivas kumar,
Andhra pradesh state seeds development corporation limited,
Kadapa, andhra pradesh - 516001.