daycare neglect to pay money back

My daughter joined the daycare in January 2020 after the lockdown she couldnt attend the daycare anymore and i still pay until end June where i mistakenly paid double, since then my child dint attend the daycare anymore and notice was given we have constantly phoned and emailed the the daycare for over a month and our calls and emails are being ignored after they were paid for months during lockdown while no services was rendered they still ignore the fact that they must pay my money back.