How to solve the problem with multiple inheritance?

Question

C++ / C#

There is a base class First containing 1 absolutely virtual function

virtual QString getInfo() =0;

2 Derived classes Basic, Vip, and

class Basic : virtual public First
class Vip : public Basic, public OtherClass (completely different class, does not belong to this hierarchy)

And there is the SuperVip class, which is the cause of the problem.

class SuperVip : public Vip, public Basic

when i try to do the following

SuperVip* svip = dynamic_cast<SuperVip*>(tmpBasic)  //некий указатель на Basic
QString result = svip->Basic::getInfo();

I receive

Basic is an ambiguous base of SuperVip

Pointing to the string with result
I understand that this is due to the fact that SuperVip inherits Basic and Vip, in turn, also inherits Basic, so the uncertainty is obtained.
I need to solve it without using virtual inheritance, please tell me how to explicitly tell the compiler which method to use and avoid uncertainty?