How many research methods to use for an MA dissertation?

Hi! I'm currently writing my master's dissertation and I'm starting to panic about my methodology. The topic of my dissertation is looking at the Red Ring of Death crisis which was a technical crisis that happened to Microsoft costing them $1.15 billion. I'm looking at how this affected their reputation etc.

For my methodology, I have conducted an interview with the ex-vice president of Microsoft at the time. I've also done a survey that I posted on here and on my Facebook etc. Do you think that's enough? That's only two research methods.

Let me know what you think! Panicking!