Mahanagar Telephone Nigam [MTNL] — Mobile [protected] 3g data payment made but service not given

Address:

400052

On 30nov i went to khar tel exchange and paid 1049 of which 500was paid for talktime topup and 549 for 3g data.The top up was done by the staff and 3g was kept pending as manager was not on duty..The cashier who took the cash asked me to note down my mobile no and serial no of 500 den note in a register. But no receipt was given so i wrote the details on a paper and asked her to stamp on it. Till today i have not got the 3g service for rs 549 i paid.They say i did not pay.They cant find the register in which i wrote and the paper on which i took a stamp is in my handwriting so it is not a proof. And they say the stamp on it is not theirs.This is cheating.Please check.