英语翻译:短文邮件

I'd like to call you, but from the morning until now, your phone is always busy at the moment, if possible, please give me a phone number is: XXXX

Dear sir or madam,
I'd like to call you, but your phone keeps busy from the earlier morning to this moment, could you give me phone call when you are free, my phone number is /////

With regards
your....