after-sales service
ˌafter-ˌsales ˈserviceBrE 
NAmE 
noun [uncountable]the fact of providing help to customers after they have bought a product, usually involving doing repairs that are needed or giving advice on how to use the product
ˌafter-ˌsales ˈserviceBrE NAmE noun [uncountable]the fact of providing help to customers after they have bought a product, usually involving doing repairs that are needed or giving advice on how to use the product
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