Celc client for many years

I have 4 contracts for almost 20 years with cellc. I was asked that 2 of my numbers i had to change settings to vodacom network connection. Since then on my 1 number i had problems everyday. No network. I have to change between cellc and vodacom. Some time for 5 hours no signal. Also i load 1g for R20 per day. Anytime after 8pm i cant use the data thats left. I loose anything from 900mb down every night. And no 4g???