The failure I experienced with ActivTrades happened on futures a long time ago, before they provided CFD-Forex
They let my account hold ghost positions that my platform would not display. Despite my expressed doubts during 1 week, they weren’t able to check my positions correctly and let my balance drop in negative territory for many thousands, which is normally technically impossible due to exchange and broker margins.
I signed an agreement to not reveal this failure during many years after they agreed to refund me only 50% of my losses. Scary and worrying incompetency if you ask me
This was technical issue, It can happened to everyone, from time to time. The important thing is how often and how will they fix it, if it was me, I would demand more than 50%. I don`t think you can make conclusion based on single events long time ago. I am not defending them I monitor closely the execution in every broker that I am using and I assume that every one of them will try to do something against my interest . For example last week I had 6$ slippage on Gold in Darwinex on one of my trades
Here is their answer
Thanks for your message, I am sorry to hear you experienced slippage in your trade.
Kindly note that your trade was filled with slippage because of market volatility when your trade was executed. Below you can find a screenshot of the candle on the MT4 chart at 10:00 MT4 server time, which is precisely when your order was filled.
Going forward, I would recommend reviewing a news calendar to avoid wide spreads during news releases (e.g. https://www.fxstreet.com/economic-calendar).
I know you are an experienced trader, but still I hope this article and / or this webinar prove helpful to understand why slippage takes place in OTC markets and what traders can do to avoid it.
I am very sorry we could not be of further assistance this time. "