I work for a customer service company. The told me that the greeting or the opening should be (Michael at your help. How can I help you?).

First of all, I think I should say (This is Michael. How can I help you?)

Second, I think there's a grammar mistake in their greeting and it should be (Michael **is** at your help. How can I help you?).

Finally, I think repeating the word "help" twice is not professional. It would be better to say (Michael is at your assistance. How can I help you?)

Am I right?