Virgin Media will refund a total of €3million to 100,000 Irish customers after a major investigation.
Communications regulator ComReg found that the company was continuing to charge customers after they had cancelled their service.
Comreg added that Virgin had failed to "proactively refund customers", instead keeping the money in inactive accounts.
And on Wednesday Virgin Media Ireland Ltd issued a formal commitment to refund a total of €3 million to customers.
The average refund due is €33, and will be paid by March 31.
A ComReg spokesman said: "Virgin Media will review all other credits (i.e. other than those relating to Post Cancellation Charges) on any inactive accounts and refund those credits to customers by 30 June 2021.
"Virgin Media will not in the future allow credit to remain on closed/inactive accounts.
"Virgin Media has established a dedicated helpline for customers to call in respect of the refund process. Virgin Media will also publish information on its website for customers affected by this issue. Affected Consumers may contact Virgin Media via its helpline on 1800 941 770.
"ComReg has issued an Information Notice on this issue (ComReg 23/123) which may be found in the Publications’ Section of www.comreg.ie."
