4 to 6 calls in succession, no message

They keep call me every other day,  today 03/24/2017 and said they were for the US Grant department. He had a thick Indian accent. They called back and no answer so beware.

Called left no message but caller ID said Silver Cab of P.  Who the heck is this.

Called 3 times 2 times it said from Egypt and once from Washington

202-553-4612 calls about 4-5 times in consecutive times and about 6 times per day Sun-Mon at variable times.  They do not leave a message.  I called the number back, a machine answers saying the caller is not available at this time and then it says it in Spanish,  when you. call it does not say who you are calling. I feel I am being harassed.  it is distracting and the calls come in so many different hours of the day even when you're at work or in church and or a wedding the gym or just out having an evening out with family or when we are in bed for the evening.   They need to have this STOP now!!!