ICICI Prudential AMC — my nre icici mf folio transaction blocked without prior intimation

Website:

icici pruamc.com

My name is thangaraj a c and i am a nri working in dubai.
My first purchase was on 19.08.16 with icici mf online using my nre account online payment method. My icici mf folio no. Is 8548446. After my first purchase i had received mail from icici cam that to show the source of account.in reply mail i sent my nre bank statement. After that i had sent my bank statements whenever transaction done. My fatca details updated to cams in the month of dec 2015 itself.
When i did transaction on 14.11.17 for redemption of icici pru balanced fund and transaction on 16.11.17 for purchase of icici banking fund with value of 1, 00, 000/- through m[censored]tilities online. Both transactions rejected by rta.
In last year, my transactions were accepted and asked my bank statement. I also sent my bank statement.
But this year my transactions rejected without any prior notice. I did online payment which is also not refund till date.
I don't know where is the problem and i had submitted all the documents requested by icici cam (My bank account cancelled cheq, bank statement, tax status change request form, fatca updated details and address proof). Even though there is delay in solving the problems.
I received answer from cams-icici that my details fetch from online (Which had my tax status mistake) and they could not correct it manually.
Once again i sent my bank transactions which reflecting my all icici mf purchase transactions.
I had open online folio account with other mutual fund houses like absl, dsp br same period of time and till date no problem which also maintained by cams.
I could not understand why icici mf making like this.
Icici service head number is not working. I had sent the mail to him but no reply from icici service head.
Who is next escalation? Or am i give complaint to sebi?