ITC - against taxes wrongly paid under RCM - is available to you. In other words, even assuming that subject transporter has not provided transport services to you and hence, you were not liable to pay GST under RCM, still, you can avail ITC against gst wrongly paid under RCM.
In this regard, your attention is invited to the case of BAJAJ ALLIANZ GENERAL INSURANCE CO. LTD. Versus COMMR. OF C. EX., PUNE-III as reported in 2014 (8) TMI 787 - CESTAT MUMBAI wherein in Para 7.5, it is held that as under:
"From the above discussion, it is very much clear that the insurance auxiliary services provided by the agents in the State of Jammu & Kashmir are not taxable. Therefore, the appellants are not liable to pay Service Tax for the said services of the insurance agents. In these terms, whatever credit is taken by the appellant is nothing but the refund of tax erroneously paid by them. Similar issue came before the Hon’ble Supreme Court in the case of CIT v. Mahalakshmi Textile Mills Ltd. - 1967 (5) TMI 4 - SUPREME COURT wherein the Hon’ble Supreme Court held that -
“5. By the first question the jurisdiction of the Tribunal to allow a plea inconsistent with the plea raised before the departmental authorities is canvassed. Under sub-s. (4) of s. 33 of the Indian IT Act, 1922, the Tribunal is competent to pass such orders on the appeal “as it thinks fit”. There is nothing in the IT Act which restricts the Tribunal to the determination of questions raised before the departmental authorities. All questions whether of law or of fact which relate to the assessment of the assessee may be raised before the Tribunal : If for reasons recorded by the departmental authorities in rejecting a contention raised by the assessee, grant of relief to him on another ground is justified, it would be open to the departmental authorities and the Tribunal, and indeed they would be under a duty to grant that relief.”
Furthermore, in Para 7.6 of above-said order, it was also held as follows:
"We further find that in the case of Nitco Tiles Ltd. v. CCE, Mumbai - 2007 (8) TMI 542 - CESTAT, MUMBAI, this Tribunal observed as under :-
“Further, the bar of unjust enrichment will also not apply in the present case. The appellants have taken credit of the tax paid by them; therefore the same cannot be said to be passed on to the customers.”
In these circumstances we hold that the Cenvat Credit taken by the appellant is nothing but refund of the Service Tax paid by them on the services on which they were not required to pay Service Tax."
These are ex facie views of mine and the same should not be construed as professional advice / suggestion.