Sun International review: not attending to my complaint

I have submitted a complaint about a person/employee of Sun International Grand West harassing my wife by way of making calls to her phone at all times of the night. To date I have not received any feedback from them in this regard and the person phoning is still continuing to make calls from Sun International Grand West, just last night at 2-30am they have phoned again! Please can you sort this out immediately, alternatively I will have to lay a charge against Sun International Grand West as I have the IP address of the phone.