Caller: Insolvency Management Services

Incoming phone number they give you in SMS to call them on.
They deal with American Express debts.

'Insolvency Management Services (iMS) specialise in the management of unique consumer recoveries, such as insolvency, bankruptcy, hardship, liquidation and deceased estates. iMS maintains a close and professional relationship with regulatory bodies and interdependent government departments, and applies its specialised knowledge and experience in the management of portfolios on behalf of the clients they serve. The operations model, systems and process have been specifically developed to mitigate risk whilst achieving optimum outcomes via timely actioning, case tracking and accurate performance reporting.'