Useless MTN and Melon networks

For the past 2 years I have been experiencing network breaks which to date has not been resolved. My device was taken from MTN on contract with their physical sim. I also have an esim on the Melon network which uses the MTN towers. For the past 2 months, I have been complaining to both service providers about both sim cards not picking up until I reboot my device. This has to be done in the mornings and 4-5 times a day. If in an emergency, both sims are not available to make calls which is completely senseless. I was advised by both Melon and MTN that a sim swap is required for both sims which baffles me as the MTN sim was given to me with the device from their shop. This network is absolutely useless with dealing with connectivity/ network complaints. I have asked repeatedly why is it only the MTN sims that are giving me issues on this device, whereas the Vodacom sim works perfectly fine...NO answers were given. Please think twice before using MTN as you will be paying for nothing.