Faulty device - no feedback

In August 24, I signed a 36 month contract with Vodacom for a Samsung A35s. Three months later, I noticed that the device was discharging very rapidly and it would only charge the battery up to 35% at most. I took it to Vodacom at the beginning of December. They changed some parts, and I fetched the device on the 8th of December. The issue persisted, so I took it back on the 9th.

To date, there is no feedback on the progress. I don't have a loan phone, and I'm still paying my contract fee every month.