@Tereceag
In most cases, the requirement to collect a business card and/or brochures is so that you can prove that you were actually there and that the report is not fraudulent. (There are compliance shops that want to make sure that the materials are "approved" and "up-to-date" as well.) So, along with the other suggestions, I would also get additional proofs of visit, especially when I cannot attain the required materials. I'll snap a picture of the store front - or even something inside. I'll use GeoVerify. I'll even take a quick pic of the person whose card I could not get.
If you are not able to get the required proofs of visit, it is the editor's job to question whether or not you actually did the shop - or at least to pass it on to the project manager. If you have nothing, they simply have to trust you. If you can couple your explanation with an alternative proof, they are far more likely to trust you and, should the client raise an alarm, the MSC will be in a place to back up your report.
I have had a couple of times with apartments that I have been glad to have the backup proof. I had one apartment manager (who had nothing to give me) and who had done a terrible job (only showing me the outside of the building) claim that she did not have any tours on the day of my visit at all. Well..... I gave the MSC a picture of the apartment building, a picture of the manager and a picture of the manager's car parked at the community. I got paid. I do not believe the manager kept her job.
Hard work builds character and homework is good for your soul.