Sorry if this is in the wrong area, but I think it's best place here.
I joined a reasonably large, well known company and the first task was selecting a software package that we'll be using going forward. It will be a cost of around £10k to start, then on-going costs of around £2k a year.
I led the selection process, arranging demos with various options and then, as a team, we selected one and moved forward the purchasing process with that item.
Since making the decision to use suite A, I have been contacted by some of the other suppliers, asking how the selection process is going. Most have been fine with being told that we weren't going with them, one or two points as to why, and moving on. One supplier, suite E, however has been very pushy. He doesn't seem to want to take no for an answer.
The demo from suite E went on the longest (3hrs, rather than the 1.5-2hrs the other suppliers used) and the salesman I've been dealing with has phoned me and/or sent me emails about once a day since their demo. The one day I was out at an event, I had multiple missed calls from them, and they had managed to phone my manager and leave a message with them. Since being told that they were not the selected package, they have phoned me a couple more times, along with emails, which I can deal with. They are now trying to get hold of the technical manager, trying to get him to change the decision.
I'm not too worried about the managers over turning the decision, as we have all got on well and the selection process was very much as a team. I just want to know what I can do, either this time or next time, to convince them that the answer is no. The problem is, as I mentioned earlier, we're a well known company in the UK, so we would have been a good advert for the software suite etc.