California Codes, Civil Code - CIV, Division 3 — Obligations, Part 4 — Obligations Arising from Particular Transactions, Title 1.3 — Credit Cards, Section 1747.40
If a card issuer fails to give a timely response to an inquiry of a cardholder concerning any debit or credit applicable to an obligation incurred through the use of a credit card, he shall not be entitled to interest, finance charges, service charges, or any other charges thereon, from the date of mailing of the inquiry to date of mailing of the response.
Notes
Bars a card issuer that fails to respond timely to a cardholder’s inquiry about a debit or credit applicable to a credit-card obligation from collecting interest, finance charges, service charges, or other charges on that obligation for the period from mailing of the inquiry through mailing of the response.
Use as reference
Lexinter.net | California Code, Civil Code - CIV § 1747.40 | https://laws.lexinter.net/codes/california/civil-code/division-3/part-4/title-1-3/section-1747-40