Pathetic Customer Service

I has a contract with Rain, received the sim card on the 24th March 2020. It started to work on the 25th March 2020, i was billed pro rata on the 31st March 2020, which i did a transfer and paid it. In April the network was not working at all, so i canceled it on the 7th April 2020. On 2nd May 2020 I am debited the full amount of R250 which does not make sense , i did not use for the whole month. It makes sense to be debited pro rata even when the network was not working . All i want is my refund back, Their lines do not even work, i have sent countless emails no response.