Dysfunction service limiting the transfer from one service provider to another.

My fibre line is provided by Openserve, whilst my service provider was Telkom. I cancelled my Telkom line on 15 July 2024 and have had no luck transferring my line to another provider because said service providers say the line is locked. It is now 23 July. Open serve does not have phone numbers listed to address issues and their help bot is pathetic and an annoyance. I did get a call from Openserve to address and they said I should down load their App. Unfortunately neither the units B number or QR code is recognised by them. At wits end. I just wish there were more fibre service providers