C#/VB.Net Web Service troubleshooting

I have a web service code which I need to troubleshoot a bit and extend the features of. 1. Out of a total of 20 methods, 18 have been basically implemented. The remaining 2 methods will need to be implemented. 2. Also, a few data insert and select operations need to be added to the existing methods (MySQL DB). 3. SOAP header currently throws an exception which needs the namespace to be changed and verified. The developer should have experience working with Fiddler and a strong WebService background. Don't bid if you don't