Review TB Interest Missing from Account

I have been banking from Barclay since 1978 (43 years). When they changed to Absa, my Treasury Bill Investment interest which supposes to be deposited to my saving account, they did not deposit whenever I asked them three times in writing. All that they're saying to me. They forward my complaint to the investigation department. It has happened since December 2021. What is going on with Absa bank? Dear reader, be the judge.