S.D. Codified Laws § 49-31-52
Liability for uncollected fees
No local exchange telecommunications company has any obligation to take any legal action to enforce the collection of any charge imposed pursuant to §§ 49-31-47 to 49-31-56 , inclusive. The local exchange company is not liable for such uncollected amounts.
Source: SL 1989, ch 401, § 4A.