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SSA pays out benefits monthly base don the type and your birth date.
SSA explains the payment dates as follows:
The benefits are paid in the month following the month for which they are due. For example, you would receive your July benefit in August. Generally, the day of the month you receive your benefit payment depends on the birth date of the person for whose earnings record you receive benefits. For example, if you get benefits as a retired worker, we base your benefit payment date on your birth date. If you receive benefits based on your spouse’s work, we base your benefit payment date on your spouse’s birth date.
Here is a link to the caledar for 2016
I understand your frustration.
You need to contact your local office. I would not be allowed to intercede for you and request information about your payment.