RECENTLY VERY FEW TRANSPORTER CHARGED 5 % BY ONE AND ANOTHER CHARGED 12 % AND ANOTHER CHARGED 18 % ON BILL AND REALLY CONFUSED WHETHER CREDIT IS ALLOWABLE ON IT TO US AS WE ARE RECIPIENT AND EARLIER PAID 5% ON TOTAL VALUE AS REVERSE CHARGE MECHANISM. PLEASE TELL CHARGED BY GTA PROVIDER IS VOID OR NOT AND IF WE HAVE ANY PROVISION NOT TO ACCEPT THIS TYPE OF BILL. IN CARGO SERVICE 18% VALID BUT WHAT ABOUT GTA PROVIDER AS WE ARE RECIPIENT OF SERVICE. PL HELP