Lazy and condescending service

After visiting various Vodashops in JHB and Welkom, we still can't connect our new Sony M4 Aqua to the LTE network. The problem is very clear in that the phone refuses to select the LTE APN. This is a known Sony Android problem. The engineer at the Advance repair centre, after all the effort sending the phone in for repairs just report no issues due to LTE not being in Welkom. That is irrelevant and condescending for intelligent customers. The phone should connect LTE in JHB or where LTE IS available and it does not. It does not select the LTE APN and refuses to select the LTE APN on the phone. The engineer was lazy. I want a new phone that does select the LTE APN and connect to the network since we are paying for that. The phone is still under warrantee.