How to use response SOAP with prefix?

I have a problem when I try to use WS.verifyElementText and the XML response has prefix:
for example

  <ns2:showBalances>false</ns2:showBalances>

I can’t get the value false.

WS.verifyElementText(response, “queryOCSBalancesAndBoltonsResponse.showBalances”,
“false”)

Help!