Re: On Job seekers allowance ATM: Why would my local social welfare office be calling
No, it's not always bad news - SW may be contacting you with results of a means test, or they may need you to sign something.
Even though the savings aren't counted, you should have told SW about them anyway - if that's what they're asking about, you should bring a statement from the Credit Union and explain that you thought you didn't have to declare it (just as you said in your post).
Don't worry!