Telkom- inability to provide customer service

My mother has a capped adsl line with Telkom. During the lockdown we needed to purchase more data and all the Telkom information stated that this must be done online . However this is not possible as the self service portal is not working. This was cofirmed by the technical team. From 10 April to 20 April I have made at least 15 calls to Telkom on my mother's behalf and have been passed from the Billing to the Technical to the Sales Department and no one has been able to assist us or give me any indication as to when this issue will be resolved. This is an unbelievably frustrating situation and indication of extremely poor cutomer service from Telkom staff who are not equipped to deal with basic problems.