Dublin Bus users with monthly and yearly tickets are being offered refunds for every day lost in the strike.

With the stoppages now in their fourth day and another 15 days of walk-outs planned, the company said the pay dispute has already cost it €4m.

But bus users who want to claim back costs for the disruption to their journeys and commutes will have to wait until the strike is called off and a deal done with unions.

“To date, this industrial action has cost the company in excess of €4m and continues to impact the financial stability of the company,” Dublin Bus said.

Refunds will compound the financial pressures on the company with some users in line for refunds of more than €100 if the strikes run as planned.

Transport Minister Shane Ross has repeatedly insisted he cannot step in to try and resolve the dispute with newly-announced stoppages this month set for September 27 and 28.

These are in addition to the 48-hour strike already scheduled for next week, on September 23 and 24.

Next month, further strike days are planned for October 1, 5, 7, 10, 12, 14, 18, 19, 24, 26 and 29.

Bus users with Leap Cards for annual and monthly travel will be issued a refund by Dublin Bus for each day lost due to the strikes.

These can be collected at the company’s head office on O’Connell Street while others who missed out on Sightseeing Tours and Airlink services can also seek refunds or ask for their trip to be rescheduled.