Former Sears Chief Executive Edward Lampert’s ESL Investments Inc. has shot back at allegations made by unsecured creditors in their call for a deeper look at the debt transactions tied to the firm.

The response from ESL comes days after the retailer’s committee of unsecured creditors filed court papers requesting more documents to investigate the deals between Mr. Lampert’s hedge fund and Sears dating back to the retailer’s merger with Kmart in 2005.

The...