Pathetic Customer Service!!!

I received a R500 voucher from my husband in July 2020. I went in December 2020 to purchase goods at a branch and was told there was only R48.00 on the voucher, after numerous trips to and from the store confirmed it was voucher *****, I may collect my new voucher! I went to collect and it has still not been sorted out. Three months have gone by and I STILL DON’T HAVE MY VOUCHER! I have not had a phone all in weeks with regards to this matter! If this is not sorted and a new voucher with my money loaded is not ready for me for collection by the end of the month I will take this further! Alternatively if you are unable to sort a voucher then I want my R500 back in cash! Three months with no response and no solution is unacceptable and poor customer service.