Bad service from Supersonic

I am very disappointed with the service received from Supersonic. I upgrade my package mid Desember, received an email and sms stated: Dear Customer, your request to change your product to FLTE PROMO UNCAPPED @R999 has been processed and will be effective on 2020/12/24 . WhatsApp queries: ***. The supersonic Team. On the 24Des, I call customer care where they lock my call stating that they will request asap for the portal to correct the problem. On the 29 I call again with same response. In mean time I can't do my work from home as I needed internet. Allso I used up all my call time, as twice I was on the phone for long time. I am so frustrated and don't know how to fix this.