efile4Biz vs boomerang carnets: most-reported complaints compared
Most-reported issues at efile4Biz and boomerang carnets, according to reviewers on Trustpilot — classified by our automated reader and backed by verbatim quotes from distinct reviews. This is a side-by-side of what reviewers report, not a score, rating or recommendation for either company.
efile4Biz
TrustScore 4.7 · 12,180 reviews on Trustpilot.
324 reviews analysed, 2025-12-21 to 2026-08-26.
Complaint rate (recent window): 8%
100% of negative reviews get a company reply.
“they do not have a customer service line you can call.”
boomerang carnets
TrustScore 4.9 · 1,416 reviews on Trustpilot.
211 reviews analysed, 2018-09-03 to 2026-09-23.
Complaint rate (recent window): 2%
0% of negative reviews get a company reply.
“you failed to register us appropriately causing issues in foreign countries”
Reported on both
Issues with an evidenced category (at least two verbatim quotes) on both sides.
| Issue | efile4Biz | boomerang carnets |
|---|---|---|
| Support unhelpful | 24% | 38% |
| Other | 18% | 38% |
Method: reviews are classified into a fixed complaint taxonomy by an automated reader; every category shown is backed by at least two verbatim quotes from distinct reviews. Figures are census classifications, not official statistics, and reflect what reviewers reported — not findings of wrongdoing by either company. Not affiliated with, endorsed by, or sponsored by Trustpilot A/S, efile4Biz or boomerang carnets.