Faulty S5 mini Samsung

I had problems with my S5 mini from day one. Phone loosing signal. Message don't come threw right away unless I open to check for message. Sometime my phone calls also don't come threw. I have to restart my phone between 5 and 10 times a day. The phone was send to Vodafone customer care as well as Samsung technician.<br> The report said there is nothing wrong. So I contacted Samsung by mail. The responds were quick and then they stop contacting me. The S5 Mini were discontinued 5 months after it came on the market because of all the problems. I feel why must I pay for a phone that does not work properly and Samsung did admit there are problems with the S5 mini's. I feel that they must replace the phone.