Instagram does not have a direct customer service telephone number/email address. You can only report hacked accounts or fraud/scams etc by pressing a button where NOTHING happens. You either do not get a response at all or it may take weeks for something as simple as a picture to be removed but then the hackers can repost it. Hackers are making profiles public, making videos of individual faces promoting fraud/scams using hacked pages to promote fraud and are scamming people into sending them their hard earned money. 

Instagram are not removing pictures and hacked pages quickly enough or at all. This is a scary thought, nudity, violence, abuse, bullying etc all gets to stay on this huge platform and go viral in a matter of hours. This is not ok and needs to be stopped!!!