Dear friend assuming that u r a lawyer , our profession is recognized and projected as a "service ". So, it is not advisable to proceed against erring clients. They will make a bad propaganda against u. This is not a coward behaviour. These are experiences in the professional journey . Delicately raise the issue and collect balance of fees. Strictly going by the law , as an ordinary business man will have negative impact on you and ur future career.
Hi. From the commercial point of view, you should first take a call as to how aggressive you want to be in the recovery process. From the legal point of view, we can start by sending a legal notice which can shake things up and they might pay up or offer some settlement. In case no payment is received, we can then file a case for recovery/specific performance of contract.