Bandcamp is not a label, a record company, a publisher, nor a distributor and should not be listed as such. When submitting a Bandcamp sourced item, use whatever 'label' information is provided on the pages at Bandcamp, or via the artwork of the downloaded release. If there is no mention of a label, use Not On Label and if the act in question have issued more than one release, then Not On Label (Artist Name Self-released) should be used.
Bandcamp is a portal and a host and, to a lesser extent, a store front for independent artists. It should only ever be used in conjunction with the 'Exclusive Retailer' tag, when it is certain that a release is exclusive to the site, i.e. it is stated as such on the release page, or if there is musical content that is only available through them, and nowhere else.