Poor service and no response to emails

Switch from LTE to Fibre because fibre finally live in my area, nightmare arrangements and finally get billed 23 May with very strange amounts. Asked for an explanation on the same day, called promised an answer, follow up email 26 May, still no answer but they want to debit my account today. I will be reversing it. Also had NO internet for 3 days during the month. RSA# ********** , RSA# ********** .