Escalate from polite reminder to formal legal notice, in order.
For Businesses & freelancers · 4 documents
A formal demand for payment of outstanding dues.
The statutory notice if a cheque has bounced.
A lawyer-style legal notice before escalating further.
Invoke arbitration where the contract provides for it.
A suggested order, not legal advice. Which documents you actually need depends on your situation — confirm anything important with a qualified advocate.