£50 referral

Hi my mum refers me to join bulb last month I whent active 2 weeks ago I spoke to one of your people on Facebook and was told when I top up I would get i link for my £50 credit I have topped up about 3 time since joining you company I have sent email Facebook message asking for help about how I go about it as I not received any thing about it and now am just getting egnored on everything can anyone please tell me why I haven’t got me £50 like I was promised thanks