Is it considered an injustice to you on his part if he wronged you and invoked God against you, and in his supplication he exceeded what you deserved, and all his invocations against you were answered? And is it permissible for you to invoke God against him to punish him for his transgression in supplication?

You must repent to Allah for the injustice you have committed. If someone transgresses against you by supplicating against you, you may supplicate against them in proportion to their transgression, but forgiveness is better. Everything that befalls you is by the decree of Allah, and it may be due to your sins; for calamities strike a person because of their sins. Therefore, you must make a sincere repentance from all sins, strive in obedience to Allah, and ask Him to rectify your condition and remove harm.