We dont get our instant prizes when we complain on Facebook they ignore us

These ones promote **** competition they dont send our instant prize.on their website you enter and win then they say wait for sms with your instant prize but you never receive any sms iam talking about their ongoing competition which started on the 15th of September and is ending on December they dont bother sending our instant prizes no one has received it i won instant prize more than 3 times yet nothing.people should refrain from entering their competition