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after-sales service
after-sales adj. 
/ˈaftəseɪlz/,
Brit. /ˈɑːftəseɪlz/
, /ˈɑːftəseɪlz//ˈaftəseɪlz/U.S. /ˈæftərˌseɪlz/
(attributive) (of a service connected with a purchased item) offered or provided by a retailer or manufacturer after the sale of an item; frequently in after-sales service; cf. post-sales adj. at post- prefix 2a(a)(ii)./ˈæftərˌseɪlz/ΚΠ
1918 Syracuse (N.Y.) Herald 17 Feb. (Auto section) 4 (advt.) More important is the after sales service.
1955 Times 13 May 6/5 British manufacturers of aircraft and aero-engines are devoting special attention to ‘after-sales’ service.
1976 Leicester Trader 24 Nov. 21/2 They do part-exchanges, offer an excellent after-sales service and an insurance repair service.
2002 Which? Car 15/1 A few manufacturers seem to be putting more effort into making a sale than they do into after-sales care.
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as lemmas