For assistance with disputes, you can reach out to the Citizens Advice Bureau for general advice, especially if it involves consumer issues. If your dispute pertains to an invoice, Birmingham offers a dedicated page where you can dispute an invoice.
If the dispute relates to land ownership or boundaries and it involves council-owned land, you can report it via the relevant forms on the council's website. For other private disputes, it's best to resolve them directly with the concerned party or seek legal advice.