Revenue overpaid me

Hi wondering If anyone could help.

I submitted my statement of liability and tax return form and seen I was owed €2201. Clearly wrong Basically I’m in a job now for 2 years in march but previously I worked in another job here and there . But I stopped working there but my boss still has me on revenue . It’s a small family owned shop so not much higher ups or executives to notice .

He submitted that I earned 100 euro a week for 52 weeks , €5200 for the year but that I paid 2600 in tax . Revenue then paid it back to me and it came in this morning . I don’t know what to do I’m not going to spend it do I ring them and tell them or say nothing . Any help appreciated