This こられる is the rareru-form of くる, and くる is a subsidiary verb you probably already know. Here, both -てくる means something like "up until now".
Difference between -ていく and -てくる
Why こられる instead of くる? Although rareru-form is usually a passive-form, it has many uses, one of which is honorific.
Meaning of お支払いを希望される方
What is the implicit subject ...