Complain to telkom data contract

I have a 24 month data contract with telkom on *** LTE router. I have been paying every month as my 20 gig data was loaded every month end. Suddenly this month only 10 gig was loaded. It has been very difficult to call or go to telkom stores to lodge a complain due to lockdown. Their voice machines would make me wait on hold for more tan half an hour on one call The 10 gig that was loaded for this month has depleted as it runs so fast towards finish

Please help to look and check as to what the problem could be . Thanks Ronnie Moffat. ***