On 10AM above all look normal, the data symbol is still on 4G/H

suddenly after I topup my prepaid using M2U and tried to buy data but I cannot access Hotlink RED
because no network

I reboot my phone and nano sim card few times, also no sign of changing

Call Maxis centre they told me my network is normal

Now I only can received call or SMS

This is so annoying

Is is because Maxis MU2 promotion topup prepaid system clashing with my network?

I need advice.

Please help