I flew WT+ IAD -LON-AGP in April. LHR - AGP was cancelled, I was auto- rebooked to a flight that a
departed before I arrived. I was booked again to a flight that made sense, that flight got canceled and I was rebooked through LGW. All in four days.

My return (which was flown as originally ticketed) TPsand Avios credited without issue. The outbound didn’t post. I waited two weeks and then pinged BA every week for 6 weeks. Same ticket number issue as OP above. Phone x2, web site x2 and fax x2 and BA Lurker. The points/TPs credited this week.