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I am referred to you by xxx. I am calling you to establish contact and to introduce myself to you. I will have xxx to call you and he/she will take over from there.
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I am referred to you by Xxx. I am calling to make an introduction of myself and to let you know what kind of services I am seeking for and to inquire about you services.
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I am referred to you by Xxx. I am calling to make an introduction of myself and to seeks for and inquire about your services.
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I am referred to you by xxx. I am calling you to establish contact and to introduce myself to you because I am seeking for xxx services.
Can I phrase the above sentences such ways? Please advise. I really do not know how to respond and talk in a situation where I need to call someone to inquire about services.