Siemens Digital Industries Software Network Operations Engineer interview questions

I got a mail from mentor graphics 2 months ago and they asked me to come to their location for first round of technical interview. On the same day they informed me that I am through second round and my second round will be a telephonic round for one hour with a onsite member.Soon after clearing that round again they asked me to attend the telephone round with one more onsite guy for another hour. After all these rounds they made me to wait for 2 weeks and after that HR called me and informed that all my results are positive and that I may have one more round with a US member through telephone .After that call there is no response from them and it went 5 weeks I am let without a response. Now should I wait for this company call or should I go for other company interviews?