but. Note the solemn antithesis.
made Me to serve. Put by Figure of speech Metonymy (of Effect, of the verb), for the judicial consequences of their sins.
Related Commentaries of Isaiah 43:24
Isaiah 43:24
24 Thou hast bought me no sweet cane with money, neither hast thou fillede me with the fat of thy sacrifices: but thou hast made me to serve with thy sins, thou hast wearied me with thine iniquities.