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I will try to best answer your question.
I believe you received retroactive payments until March because that is likely win you applied for the benefit. Social Security makes payments retroactive back to date of application. You can still contact Social Security and try to request that it be made retroactive to when you became a 66. However, I regret to say it will be difficult to obtain retroactive benefits prior to your request for benefits.
I know that this is not the answer you would like to hear, but I believe it is correct. I prefer to be honest with you and give you accurate information rather then just tell you what you want to hear. Please don't hold that against me when rating me.