Changed flight, no notification, terrible refund process

I booked my flight in May for a flight only in December so that I would avoid the expensive price hike and stress. LAM changed my flight without even sending me a notification, I only found out because my partner booked the same one through a travel agent and they were notified. We now have a layover in Maputo as well as another stop to refuel, what went from a direct flight now became a 2 stop flight and not only this now because of those changes and delays I would now miss my connecting flights. When I called LAM they said that the only way I could make my flights was to change my other flights and leave a day earlier (at my own expense). I am now in the process of cancelling my flight to get a refund and no one answers their emails, the staff are not friendly when I call and just tell me to wait. I am so disappointed in their service, I will next time make sure to pay the bit extra to not have to deal with them.