How can one atone for overcharging customers, after repenting and feeling remorse for it?

Repentance from a sin involves abandoning it, regretting having committed it, and resolving not to return to it in the future. It is also necessary to return money to its owners if they are known; otherwise, it should be given as charity on their behalf. Furthermore, one must be careful not to associate with the corrupt person who incited you to steal, lest such association lead to a relapse and a return to sin.