Beware the telephone number 09011 490500 is a premium rate scam number and not a real DWP number. Although calls to this scam number may connect you to the DWP, this is only because callers have created a call divert service. This means that when you call the number 09011 490500 you will be connected to the DWP line, but only after being diverted via the premium rate line you have called. Charges will be astronomical for calls to this number.
If you find the telephone number 09011 490500 among search results for any DWP department then please do not call. Instead you should report to teh department of Work and Pensions.