Poor after sales service

I bought simcard and it was delivered within 4 days on 8 June 2020. I took R479 unlimited package but was still disconnected every night beyween 6-11pm. I have 4 service enquiry tickets, two email replies but no resolution. Then on 1 July they did not deduct debit order. No internet since 1 July. 3 service enquiry tickets sent with no response. This is really unacceptable.