ACT Fibernet — discrepancy in bill amount and internet speed is very low all the time

I'm unable to connect with act customer care personnel to discuss about the bill discrepancy in august 2020 month bill.
On taking the connection, we were promised a discount of rs.200. From the bill amount since we moved from bsnl to act.
Till date we availed that offer. But in august month's bill, we were charged rs. 1013/- instead of rs.967/-. Only rs.160/- is considered as a discount amount for net tax calculation.

Major problem faced is, they don't provide promised internet speed. Also contacting them is a difficult task. They have in-built support system which never gives options for problems like this. Also there is no customer care number to lodge a complaint for these categories. Wondering how they could be very confident about the bill discrepancy part complaints raised are also not addressed on time.