It would seem that the powers that be would want everyone to use the 'Hot Phones' provided within the 'Department Of Work & Pensions', if & when those amongst us can find the time to visit the respective departments between circumstances 'beyond' each individuals control. The respective number being 08456020206.
There are,I have no doubt,many amongst us who have many valid reasons to communicate with the DWP & just do not have the time (due to circumstances....,ie working & cant afford the time off to visit these wonderful 'Hot Phones' to sort their problems out & get the above number which keeps them on line for so long that the 'phone bill becomes more than affordable) to visit those 'phones' of which we are so' reliably' informed.
Is there 'Anyone Out there?'............

The number you quoted, 0845 602 0206, is the call centre for Job Centre Plus in the Midlands (Walsall, Wombourne, etc). In future please try to give as much detail as possible when you ask the forum to find a geographical equivalent.

In the database there are loads of numbers both under DWP and Job Centre Plus although the above number is not listed. Suggest you call Job Centre Plus in Birmingham whose 0845 number is very similar to the one you quoted.  It may even be the same office:

0845 602 0265
0121 480 3500