This issue of Hitbtc to withdrawal of $DOGE start since last year and I'm surprised that they still didn't fixed the problem. One thing I doubt about this accusation is how the heck OP will deposit huge amount of Dogecoin to Hitbtc without checking the price of the order book. There's a lot of top tier exchange like Binance and Kucoin that accepts $DOGE with the updated price yet he still deposit on Hitbtc with lower rate.
Coincidence? OFC Not.
OP bought cheap $DOGE to hitbtc and he is using this scam accusation to push Hitbtc to release his $DOGE(as if hitbtc will read here) that he bought cheap. He is just trying to make a quick profit by selling it on other exchange.
Check reference on how long does Hitbtc have problem on DOGE withdrawal:
https://www.reddit.com/r/hitbtc/comments/q7fh0d/doge_withdrawal/There is a good chance that what you suspect will come true. The OP has so far not shared any evidence to show that he actually made the deposit. As a result its activities are being questioned here, since the problem of dogecoin withdrawal was already on hitbtc. Op may not know that hitbtc's reputation in this forum is already bad and they left the forum long ago. So such an attempt will not bring good results for him.