Failure to attend to defective gate motor installe

Vistel, a service provider appointed by my Insurance, Outsurance, installed a gate motor (new). We will close the gate and the gate will b opened when we woke up, without been opened by anyone. The matter was reported and nothing happened. Made follow-ups after two weeks, they sent the technician who checked the motor and guaranteed that it's fixed. The problem still persisted to a point where I had no option but to operate the gate manually. I sent Emails enquiring when they will come attend to my problem, they did not even bother to respond and nothing happened till today.