I agree with Jesse,

This is sad and it shows you how many people can only use this techniques in order to overpower competitors, instead of working their a***s off in order to achieve good results.

I feel sorry for them, but on the other side, if I were you I would be happy, because you are doing a good job with your campaign that this competitor can't really compete with.

I don't think you can really prevent this, instead notify bing and if you know exactly which company has done it to you, you might report them.

Hello there,

Sometimes Google picks up other information from the page rather than using the meta description when it considers that your meta description are not very relevant for what customers have looked for.

Just make your meta descriptions more relevant.

I agree with Devanur.

it is very difficult to define relevancy for links as you can always link to industries less related to your core business but still relevant.

Also, when you naturally get links, you can't control where those links come from and unless they are from dodgy sites, very low quality sites, you won't spend too much time in dealing with them (especially if the number is not too high)

I do think that Google doesn't penalize you for having those links as they are still relevant for your business in some way.

Another option, a bit time consuming, but it might give you some information, is to go through the orders you received, let's say in the past week and see if the number matches with the number of conversions reported in analytics.

But I do believe that running a test is the best option because your data may not be accurate already.

Good luck!