Collector of Taxes at Cumbernauld phone line problem?

I've tried phoning the Cumbernauld Collector (CT matters) for the past 2 months and the line is always engaged (01236 785057)  Is there some problem with it?  When you phone Shipley now you get an automated message telling you to ring th Cumbernauld number - its all pretty useless.

Anyone else had any problems?

I had to order a new CT61 today (on a different number 01236 785498) and got through to someone to order the form and on mentioning the problem with the other number was told serveral people had tried his number  hoping to be put through.