• Tax credit claim U/S 90/90A not considered

This is for Assessment year 2018-2019. I was in USA working for United states based company till July 2017. Then i moved back to India and started working for an Indian company from 21st august 2017. Hence for the fy 2017-2018, i had some foreign income.
Now in the ITR-2 filing, I claimed the tax that i paid to the United states government under section 90/90A of Indian tax to avoid double taxation in India.
1. There was a intimation I received U/S 143(1) and the tax relief claim was not considered and hence the demand for the same was raised in the intimation.
2. I responded to that by filing a rectification and attaching form 67, US tax return, Form w2 (which is proof of income in United states) as document proofs.
3. The above rectification was not considered and I received an Intimation U/S 154. In that form there were 2 columns of significance viz. "As modified by assessing officer", "As computed under section 154". From this intimation, it appeared that the assessing officer considered the complete tax relief claim but CPC didn't consider the amount at all and hence the demand for the same amount as specified in 143 was again raised. 
In the intimation 154, it appears that the justification for rejection wasn't printed completely. The justification was
"Rectification u/s.154 of the Income Tax Act has not altered/partially altered the demand raised u/s.143(1) as there is a variance in the tax credits claimed &
allowed. variance is due to non availability of TDS credit which is on account of"

4. In response to that, i raised a grievance to the CPC ( not the assessing officer) asking to provide full justification or cancel the demand.

5. In response to the grievance, i received a response saying
"Resolution: Dear Taxpayer, with regards to your query, please contact your Jurisdictional AO for further clarifications with this regard. To know the details of your Jurisdictional Assessing Officer, Go to www.Incometaxindiaefiling.gov.in -> Quick links -> Know your AO........"

Can you please suggest any steps that we can take for this. Few options:
1.File a grievance again but this time, i will address it to assessing officer and not the CPC.
2. File a rectification again and do not agree with the outstanding demand. This time in rectification, i shall explicitly mention that "i am a attaching form 67, us tax return, form w2 as proof of taxes paid in United states as an explanation for them to consider. I can also attach my payslips documents as extra proof.
3. Contact AO in person

Thanks
Rahul