Top Up Data Problem

I have tried to call Telkom on tel # 10210 twice today and on both occassions I held on for 27 minutes and after the consultant came on the line and I explained my query, the call died. I then tried to chat to an agent via the Telkom app but it has a "site search 360 error no input field found".

Here is what I want to fix....Towards the end of April I bought 20gig top up data which expires on 1 June and on 1 May I got my new monthly subscription allowance of 20gig which expires on 1 July. But instead of Telkom using my data from my top up portion which expires first, they are using my subscription data first. This means if I only use 20gig this month, I will lose my top up data!

Can someone at telkom please get back to me on this.