Rain ****ming us

Rain is horrible. 1 their network is slow between 7pm and 10.Now the double billed end of November and switched our connection off when they couldn't bill us end of December. We tried sending proof that they took R650 twice in November but they denying, yesterday we visited the bank to confirm and it is confirmed that they took our money. I don't know what to call this because they keep trying to bill us since. We sent proof nothing has been done yet.