I called the technician who installed my HD+ in Feb 2024, he said backend work is going on for shifting the transponders of HD+1 channels because of this channels are removed. Many phone calls and complaints are coming in regarding this issue.
He also checked the same on his STB, he said 2 HD+1 channels are available for him and the rest are removed. In conclusion, he said don't blindly trust on customer care. They don't know anything about these technical terms & you will these the missing channels very soon.