They keep track of how often you called and when was the last time you called. Just an advice not to bug them with unnecessary questions. I called them today and told her that I called you last month about my case and you asked to call back again after April Ist, but she said that I also called on Feb 22nd which I don\'t remember. If you have genuine question, go ahead and call them, otherwise my advice is not to annoy them since it may not help calling them frequently. Just thought it may help if someone is not aware of it.