Calls automatically ended when there is a phone queue

[#1]

I needed to make a phone call but the call was automatically ended within a second. Apparently phone calls can't be made where there are queues according to PlusNet customer service. 

Is there a work around that could resolve this problem?

[#2]

Mobile phone callers are able to make calls to Plusnet queues (according to this article The PlusNet Phone System / IVR - Plusnet Community), what is preventing us joining queues elsewhere?

[#3]

I've made many calls to numbers where there were queues.

needed to make a phone call but the call was automatically ended within a second

That sounds more like network congestion, so the call could not be made