Move on from shared if you can afford it. It will save you lots for headaches...
I moved from Martfox a while ago too, and tried getting in touch with them a few times but nothing. I still have a few domains registered through them that I need to shift.
I would recommend eukhost, they are quick and efficient, my site hasnt been down once since moving to them 18 months ago, I am now on dedicated with them.
I believe, shared hosting not much useful due to lots of updates regarding web page speed as Google had considered it as its core algorithm update that website with low page speed will be penalized, I have moved my ecommerce store to cloudways managed ecommerce hosting and everything is going good now.
BTW: we updated our Anlsible script for Virtual Private Server (VPS) and Virtual Dedicated Servers (VDS) https://github.com/cscart/server-ansible-playbooks This script allows you to set the CS-Cart environment in several clicks.
There are lot of recommendation here about hosting provider. But it's difficult to identify right hosting for your website. In my opinion about hosting always go with those provider who have 24/7 technical support because it's really painful when you are in trouble and didn't receive response.