Indian Railway Catering & Tourism Corporation [IRCTC] — extra charged against seat

Address:

Surat, Gujarat

Hello i was travelling from jaipur to surat on dated 11-12-19 in train number 12980 in 3rd ac class with general ticket.
I had boarded the 3rd ac coach with asking the tc and he had charged me extra than mentioned in receipt. Through vacant seat was there he had given me then also he had taken charge of penalty and difference fare other than this he had charged me more. He had charged me 2500₹ and given me receipt of 1390₹ and bought a general ticket of 250₹ total my journey cost is of 2750₹