Tier upgrade

I wrote to avbob on the 28th September about my tier upgrade and i also called i was put on hold for more than 10min and ended up hanging up the call i tried to follow up the email and i was told that i need to sort it out with the rewards department and i did that on the website i got a response that i need to contact the customer care i have been trying since the 28th till todate i haven't been assisted i went to the branch today i was told they can't assist as they have limited access to the system.i have been a member for more than 10 years but on the system it shows that i have been a member for less than 10 year and its affecting the memberrrward that i should be getting instead of getting R800 voucher i am getting 500 voucher because i am still under bronze tier instead of silver tier i am not happy about this because i have tried everything to sort this out but no one is willing to assist me and i am paying monthly without fail