Linkmarketservices bad service

I've tried to phone this people on several number but I don't get through to them the due day to phone then is tomorrow 14th December 2018 and I'm trying to phone them since 11th of December 2018... I understand that it's call centre based but not to f¥£€$%# get through they tell you to leave your details but they don't come back. This is bad bad bad service. I'll never advise people to do business with them...