LTE Service not working after changing to contract

<p>I have an LG G5 SE, this is an LTE enabled smartphone. On Monday 6 March 2017 my sim was moved from prepaid to a top-up contract. LTE 4G was working fine on the phone before this move. Now I don't get a 4G signal anymore. I have contacted the vodacom call center 4 times and they are unable to resolve the issue. I have even been to a vodacom shop in Gatway and all every one keeps telling me is that the service is active and I need to restart my phone and wait one hour. It's been a week now and its still not working.</p> <p> </p>