I booked a flight on the avios 50% sale to EDI - LHR-CPT going out on 2/2/21 and returning 11/3/21. Both of my flights on the 2nd (EDI - LHR and LHR - CPT) were cancelled on the 7th Jan. I went though MMB that day and after trying quite a few different dates to find available dates I was able to book a flight on the same route on 23/10/21 returning 23/11/21.

The following morning I checked MMB for my trip and saw that the original flight on the 2nd Feb was sill showing (as cancelled) on the booking along with my new flights in Oct and Nov. I contacted BA through twitter stating that there was an issue with MMB and could the cancelled flight be removed. I eventually got a reply on the 15th Jan stating -

"We're sorry for the late response. I've removed the flights for early February from your itinerary. I've also asked our Ticketing team to reissue the ticket to match the itinerary. Once this is done, you'll be able to view the finished booking in Manage My Booking. If you have any questions, come back to us here, and we'll be happy to help"

Unfortunately yesterday I received an email from BA saying they had cancelled my ticket and refunded the avios and payment to my credit card. I phoned the executive club number immediately and the man I spoke to was really unhelpful (which is not my usual experience with them) and kept saying that the flights I had weren't confirmed (although they did show as confirmed on MMB) and that there was nothing he could do as the refund had been processed.. When I said that I hadn't ever asked for my ticket to be cancelled and that I had booked in the avios sale, he said that avios sale flight were only valid until June and all I could do is make a complaint on BA.com

I have gone back to BA through twitter and am awaiting a response. I am frustrated as the online system allowed me to pick alternative flights to CPT in Oct and if it hadn't I would have changed my dates to May/June.