Can't get back my paid Starter plan after the Business plan which was free for 2 weeks

I paid in April the Starter plan for one year. But then in Juny I tried Business plan for 2 weeks for free. Now boards in my team are locked, because this Business subscription is expired. But I still have an old Starter plan subscription. And I can’t go back. I`m trying to downgrade to the Starter plan but Miro request to pay for the Starter plan one more time. How can I get back my Starter plan subscription?