Convert string with unicode escape characters to UTF-8 with Qt

I am trying to convert string in unicode to utf-8.

qDebug prints string like this:

"Fault code soap:Client: \u041F\u043E\u043B\u044C\u0437\u043E\u0432\u0430\u0442\u0435\u043B\u044C \u0441 \u0438\u0434\u0435\u043D\u0442\u0438\u0444\u0438\u043A\u0430\u0442\u043E\u0440\u043E\u043C \u00AB16163341545811\u00BB \u043D\u0435 \u043D\u0430\u0439\u0434\u0435\u043D"

I tried using QTextCodec like this but it outputs same unreadable string:

QTextCodec *codec = QTextCodec::codecForName("UTF-8");
QString readableStr = QString::fromUtf8(codec->fromUnicode(str));

What am I doing wrong?