PSPCL — extra amount in the bill

i am surinder kumar from fatehgarh churian. my power meter no. is A12EC 23 0806 X. my faulty meter was replaced on 6/10/2014.i deposited Rs.520 for new meter vide ur office receit no.335 dated 8.9.14.after one bill on avg, i got next bill in january 2015.for RS1090.but meter charges 520were included in this bill.ur office at fg churian demanded photo copy of meter fee already deposited.i submitted the same .i was told to deposit RS. 520 less.i paid rs, 570. now i got after 2 months in march .again problem is the same.this time meter fee 520+20(fine)=540 has again been reflected in the billwhile i have already submitted the amount as written above.why this amount is being claimed again &again from me?who will condone this amount of rs.540?