Slippage remains severe when market volatility is low

1. There is serious slippage when the market does not fluctuate significantly. There is a spread compared with other foreign exchange platforms at the same time, and the Vantage spread is significantly larger. 2. There is a serious slippage that leads to liquidation but there is no margin call. I ask customer service, they said that it is only happened occasionally 3. Neither the email customer service nor the account manager have a positive attitude. Even if the slippage is more serious than other platforms, they will only answer that it is a market risk. Even if I propose a solution that we both make a concession, they still ignore it. These experience are reference for other traders