你们的服电话总是忙音的，用英文怎么讲？

your calling is busing now

Your service telephone is aways busy~

The subscriber you dialed is busy now. Please redial later. 您呼叫的用户正忙，请稍后再拨。
Your serice telephone is always busy,and nobody answer it

Your service lines are always busy. I could never go through. Nobody has ever taken my call.