I get a call from this number everyday around 10am and again in the evening around 7pm.  I answered the first time.  It was a good connection but I could not get anyone to respond.  I quit answering, but that doesn't stop the calls.

These people have been calling every day, and sometimes twice a day.
They never leave a message, and when I try to call them back, the phone message says the number is "invalid". They have called from 090-1171, 090-1172, 090-1173, 090-1174 and 090-1175.

called twice on landline in last two days.
first call only heard background noise and then they hung up.
second call, asking for me by name...they listened a few seconds..
then hung up.