Nonsensical Telkom Call Centre, nonsensical service.

Got notifications that I'm due for an upgrade. Went to Telkom Northmead square to renew and was told to come on the week after 15 April 2025 so that the old contract can fall away and the new one take over. I did that and all was processed with an indication that I should contact the store by the 25th May to have the old contract cancelled. I did and it was confirmed that my number with ref number *** is now on prepaid. To my surprise for June, I'm billed for the old and new contract. Please correct this because your nonsensical contact center doesn't work.