Incorrect avios points posted With BA

[simonjones]

I’m a gold member paid cash on the BA website for the following route in economy.Booking was made and ticketed on the 10 Oct
LHR-DOH-BKK/BKK-HKG/HKG-LHR
Flights were QR (BA flight numbers but op by QR ) CX and then BA
MMB advised I would get 18,045for the trip , all flights have posted (including CX which took 3 days) tier points are correct but I’m approx 5000 short .
Raised case with BA included screen shot of MMB showing amount due , they’re saying points posted are correct . Gone back still same response
What’s next steps to get the missing points added

[JDB]

Duplicate post. Already answered.