Hyundai — charged extra for second free service

Address:

Bagpat, Uttar Pradesh

i have sent my car eon magna plus for 2nd free service on date 28-feb-2013.
while i had informed them to do normal free service as suggested by the company which includes engine oil change and oil filter change.
while i have opted for new mud flaps and a simple wheel alignment. the total amount according to me should not had exceeded[protected]rs.
while the amount charged for the service is 3500rs
even they have mentioned it wrong as third free service in the bill while it was second free service and
was done according to the recommendation by the company at 10000km


i am hereby attaching the service bill and the reference to what a service will cost on eon

http://www.cardekho.com/hyundai-eon/service-cost.htm