ICICI Bank — NRI account converted to Domestic without intimitation

I was having NRI account with ICICI since last 2 years, was regularly doing transactions. Month ago i was having some emergency problem and have tried to do online transfer. Suddenly it started asking OTP on mobile, which was not updated in system as it is not required in NRI account. Have tried to reach lot of time and finally asked me to submit documents to register mobile. Have told them that i m using this account long time ago and never asked for this OTP on mobile, always sent email only. Later they told me that your account is domestic, I lost my all the interest of my saving, which is 9% around currently. I Was never informed that your account has converted to domestic. Now asking me to complete lot of formalities - just wastage of time and money. This for not we are opening NRI account. I lost my interest amount too. This is the 4th time i have harassed by ICICI. Please do not open NRI account with ICICI, at any point of time they will change their system and u will loose your interest and then have to do lot of formalities. Have send email them but haven't got any response.