Vodacom poor Service

I had a subscription at Vodacom, on 1 December 2021 i canceled that and expected that the last debit order will be end of December 2021.How wrong was i,they kept on to debit my banking account and up to the end of April,then i instructed my bank to stop the debit order for the month.I send them numerous emails,they did not gave me any feedback.I ecpect from them to reimburse me and stop the debit order.The service was discontinued end of December