booked in J, which is available for the new date but I called probably ten times by now and I still get the same answer from different agents.

My last call was quite interesting because the agent said they cannot see the original ticket, but can see only a reissued ticket. What is strange is that the reissued ticket seems to be the first ticket I received on June 16, 2022. So I am wondering why/how the ticket was reissued when it is issued first....Anyway, the agent said they cannot automatically change the ticket because the system is giving them an error so they are calculating the fares manually based on the difference between how much I paid (according to the reissued ticket) and how much it costs now because they cannot see the original ticket before the reissued ticket. This might be the source of the issue. For what is worth, it is BA issued ticket that involves only IB flights, so IB says only BA can change and BA agents are saying what I wrote above. The last agent said he asked the back office to quote the final cost so that he will be able to change the ticket, so I am waiting for an email with a quote from the back office. I am not very optimistic about it...